i just bought and aquarium and i was just wondering if somebody knows about the pump for oxigene , i dont know if it need to be on the hole 24 hours a day and also how many times a day should i feed my Gold fishes ??? thanks.
Answers:
Run your air pump for about 8-10 hrs a day. You can also run it during day time, and switch it off after sunset, which will slow down the water movement and set a system on the fishes to indicate its sleepytime..
Feed your goldfishes 2-3 times a day, little bit every time and take care that you do not feeed them or give them more than what they can eat up in a couple of minutes.
Also try feeding flake food or frozen bloodworms rather than floating pellets, because wet and sinking food would not cause future complications in your fishes.
Goldfish can "gulp" air from the surface which means you don't really near an air. But it is best to have it it running 24/7. It's the filter you need to watch. Goldfish have a lot of waste.
Feed twice a day in small amounts. No more than the fish will eat in 5 mins.
hi, Yes you need to keep your pump on all day every day.
You shouldn't give fishes anymore than they can eat in a minute. Although it is very tempting especialy when they seem to beg at the glass. It is a good idea to keep your fish slightly hungry so that they will devour every scrap of food and thus keep the tank clean. A good method for measuring food for 1 meal is to take a pinch of food between your thumb and your middle fingertips.
feeding fishes little and often is preferable to profiding them with 1 large meal daily.
Never over feed your fish this is more deadly than under feeding them.
Hope this helps mate x
The pump is a decorative item unless it is running a filter. The way OXYGEN gets into the water is by having a large surface area. For example tanks that are column shaped allow very little oxygen exchange. Breeder tanks, which are shallow and large allow a large amount of oxygen exchange.
Feed you gold fish as much as they can eat in 2-3 minutes, twice a day.
A pump or filter should run 24 hours. It's the water movement created by these that circulates the tank water so the oxygen that dissolves into the water at the surface reaches your fish and allows the carbon dioxide that your fish produces to be released into the air. Otherwise, your fish will be gasping at the surface of the water to breathe. A filter would be a better choice, because it provides more movement in the water and will help keep the tank cleaner - although you'll still need to do water changes.
The number of times you feed should be at least two, but how much you feed them during the day is more important than than the number of times. They should get the amount they can eat in 2 to 3 minutes twice a day and no more. If you want to add the amount of the two feedings together and divide it into more feedings you can, but keep the amount you feed them for the whole day the same. I know they seem to come to the glass an look hungry all the time, but that's what they do - you have to resist the temptation to overfeed them! And it's best to give them a variety of foods so they get a well-balanced diet - it's healthier for then if you don't feed them the same thing all the time.
I'll provide a few links below where you can get more info on goldfish and their care. Good luck with your fish.
Monday, May 24, 2010
How many hours a catfish can survive without water?
i don't know when did this catfish jump out from the aquarium.
that i found it on my yard 5 hours later after the last time i saw it in the aquarium.
Answers:
That would depend a lot on what type of catfish it was and its size. Some can live for several hours. Put it back in the tank and see if it shows any movement. Some fish that look terrible can recover if found and rehydrated quickly enough.
i HAVE HAVE A lOT OF CATFISH IN MY LIFE, AND, FOR ONE THING, NEVER PUT THEM IN AN AQUARIUM WITHOUT A LID/PROTECTOR ON IT.
I FOUND THAT OUT FROM THE VERY FIRST ONE THAT I GOT {YEARS AGO--SHSSSSS-DON'T TELL ANYBODY
i WISH YOU MUCH LUCK ON THIS SWEETIE.
that i found it on my yard 5 hours later after the last time i saw it in the aquarium.
Answers:
That would depend a lot on what type of catfish it was and its size. Some can live for several hours. Put it back in the tank and see if it shows any movement. Some fish that look terrible can recover if found and rehydrated quickly enough.
i HAVE HAVE A lOT OF CATFISH IN MY LIFE, AND, FOR ONE THING, NEVER PUT THEM IN AN AQUARIUM WITHOUT A LID/PROTECTOR ON IT.
I FOUND THAT OUT FROM THE VERY FIRST ONE THAT I GOT {YEARS AGO--SHSSSSS-DON'T TELL ANYBODY
i WISH YOU MUCH LUCK ON THIS SWEETIE.
How many guppy can I keep in 1.5 gal fish tank? can I keep a small frog in there too? how about female betta?
Answers:
I would say you could keep 3 guppies and a small frog, or a small frog and a female betta. Are you refering to african dwarf frogs? I agree with ensuring you have good aeration. It is also going to be imperitive that you do constant (every 3-5 days) water changes of 20%. Due to a lot of inbreeding, guppies just aren't the hardy fish they used to be, and too much of any of the dangerous toxins created by theri waste can be really harmful to guppies. As for them having babies and overpopulating... it can be really cool to experience the birth fo the babies, without worrying about overpopulation. In a tank that small, it is likely most of the babies will get eaten anyway, if they dont you can remove them and feed them to something or give them to your LFS. males aren't necessarily prettier than females, I have some gorgeous females! I do agree though that you need at least 2 females for each male, so if you got 3, get one male two females... because he will bug the females constantly, and its best if he can divide his effort between two females. the dwarf frog won't eat your fish either, just dont put in a bullfrog... he will. good luck :) If you have any questions let me know
I was recommended to have only an inch of fish per gallon of water in my aquarium. In general, for a 1.5 gal fish tank I would say one or two guppies since they grow to about 1.5 inches. Hope this helps.
if you have an aerator.about 7 guppies if you
want them to feel comfortable...10 can be but
they will not feel that comfy.yes you can keep a small frog
but be sure to lessen the number of guppies...
as for the female betta...sure.why not...!!!
good luck
my auntie mixed in a frog and it ate all the fish so i wouldnt put one in but its up to u !
1.5 is a very small tank- I would stick to 1/2, perhaps three at most. You'll need to check and change the water religiously in such a small tank, but if you do that you could keep a frog as well. However- be careful to pick one that won't harrass the guppies, and only put it in if your tank has a lid- they jump!
With the guppies, make sure you don't get one male, one female, they breed worse than rabbits, and your tank will quickly overcrowd, as well as it being extremely stressful for the female fish to be constantly chased about. If you stick with two, I'd suggest all males, particularly as they are prettier!
Well,you can have maybe onee male and about 4 females.Or if you dont want them to breed, maybe 5 or so females.Guppies dont need to much space.If the tank is too small, maybe 3 or 4 female guppies.Hope I helped!(if you have a female and male, you might need a bigger tank, they will breed a lot!)
How many guppies should I buy?
I have a tank that has had fish in it for over a year. I just now cleaned the tank out, and the 3 fish I had in it made a leap to their death from the bowl I had them in. It is a 10 gallon tank and i put water back in it yesterday evening. How many guppies should I buy to put in it? What other fish go with guppies?
Answers:
2 pairs of guppies a pair of platies. a pair of swordtails,3 cory catfish. Neon tetras,6 of them,instead of some of the other fish(besides the catfish)Try to put in more females than males,if you can.(if the pet store lets you buy individual live bearers instead of pairs)
neons, algae eaters, and goldfish. remember 1 inch of fish per gallon of tank, and get a snail for the tank walls
Any peaceful fish can go with Guppies.
Ps. not goldfish, as someone else said.
There's a 1inch per US gallon rule with fish, (doesn't work with gold fish) So if you bought 10 guppies that were about 1 inch that would be at the max. However, keep in mind guppies reproduce like crazy, so in no time you'd have a bunch of little guppies swimming around which would push your stocking limits over the top. Also keep in mind that male guppies will harrass female guppies, so if you can keep either all male guppies (no chance for fry) or if you want fry keep a 2/1 female/male ratio so that the males don't harrass the female to death. good luck!
usually it is a gallon per fish...however, people keep more than that and it is duable. you can keep about 5-6 guppies. and other mid-dweller like tetras (about 5-6) or dwarf guramis (2-3). as a bottom dweller you can keep albino corydora catfish about 3 of them (they are pretty small).
couple of mystery snail or some cherry shrimps would be nice of cleaning algaes also..
by the way, avoid getting female guppies... they multiply fast.
A good rule of thumb is 1 inch of fish to 1 gallon of water. When you are purchasing guppies, you want a ratio of 2:1 (females to males). You can have all guppies, but small tetras would work as well in a community of guppies. Do not add too many fish at one time though. Start with the guppies, 3 to start, and then gradually add a few more fish. For a 10 gallon aquarium, I would say your safe limit would be 6-7 fish. Good luck!
Well you will need to cycle the tank first, before you buy your fish. Secondly, a few guppies at a time, not a whole bunch. No you don't need a heater if you are planning on adding goldfish, mollies, platies, pleco's which all go well with guppies. even White Clouds. I would not add more than 1 goldfish and not a common, stick with the fan tail types and get it small. For a 10 gallon you can have 20 guppies alone or 1 goldfish, 6 guppies a pleco and perhaps a White cloud.
good luck
well there is the gallon per fish rule but if you have good oxygenation and a decent filter you can scrap that rule. But you should buy guppies at a ratio of 1 male to 2 females. This is as the male tends to chase the female around and it could be very bad for the females they are pregnant. But if you don't want baby fry i suggest you just buy males as they are more colourful and pretty to look at. You can then buy some neon tetras , 2 - 3 mollies or swordtails (but they are livebearers like guppies so keep to 1 male to 2 females)
hope everything goes well
The guppies will multiply very fast to let you know. The only fish that you can put in your tank with them will be goldfish for they are the only ones that wont eat them. Any other fish will eat them but that could be a good thing on the way they multiply.
Answers:
2 pairs of guppies a pair of platies. a pair of swordtails,3 cory catfish. Neon tetras,6 of them,instead of some of the other fish(besides the catfish)Try to put in more females than males,if you can.(if the pet store lets you buy individual live bearers instead of pairs)
neons, algae eaters, and goldfish. remember 1 inch of fish per gallon of tank, and get a snail for the tank walls
Any peaceful fish can go with Guppies.
Ps. not goldfish, as someone else said.
There's a 1inch per US gallon rule with fish, (doesn't work with gold fish) So if you bought 10 guppies that were about 1 inch that would be at the max. However, keep in mind guppies reproduce like crazy, so in no time you'd have a bunch of little guppies swimming around which would push your stocking limits over the top. Also keep in mind that male guppies will harrass female guppies, so if you can keep either all male guppies (no chance for fry) or if you want fry keep a 2/1 female/male ratio so that the males don't harrass the female to death. good luck!
usually it is a gallon per fish...however, people keep more than that and it is duable. you can keep about 5-6 guppies. and other mid-dweller like tetras (about 5-6) or dwarf guramis (2-3). as a bottom dweller you can keep albino corydora catfish about 3 of them (they are pretty small).
couple of mystery snail or some cherry shrimps would be nice of cleaning algaes also..
by the way, avoid getting female guppies... they multiply fast.
A good rule of thumb is 1 inch of fish to 1 gallon of water. When you are purchasing guppies, you want a ratio of 2:1 (females to males). You can have all guppies, but small tetras would work as well in a community of guppies. Do not add too many fish at one time though. Start with the guppies, 3 to start, and then gradually add a few more fish. For a 10 gallon aquarium, I would say your safe limit would be 6-7 fish. Good luck!
Well you will need to cycle the tank first, before you buy your fish. Secondly, a few guppies at a time, not a whole bunch. No you don't need a heater if you are planning on adding goldfish, mollies, platies, pleco's which all go well with guppies. even White Clouds. I would not add more than 1 goldfish and not a common, stick with the fan tail types and get it small. For a 10 gallon you can have 20 guppies alone or 1 goldfish, 6 guppies a pleco and perhaps a White cloud.
good luck
well there is the gallon per fish rule but if you have good oxygenation and a decent filter you can scrap that rule. But you should buy guppies at a ratio of 1 male to 2 females. This is as the male tends to chase the female around and it could be very bad for the females they are pregnant. But if you don't want baby fry i suggest you just buy males as they are more colourful and pretty to look at. You can then buy some neon tetras , 2 - 3 mollies or swordtails (but they are livebearers like guppies so keep to 1 male to 2 females)
hope everything goes well
The guppies will multiply very fast to let you know. The only fish that you can put in your tank with them will be goldfish for they are the only ones that wont eat them. Any other fish will eat them but that could be a good thing on the way they multiply.
How many guppies in 17 litre tank?
Okay I have done all I can got the temperature perfect the cycling over and done with and I am ready to go out and get my fish I want to get guppies only as my tank is set up for exactlly their needs. So how many can a 17 ltr tank take?
Answers:
Consider it as 1 guppy per 2 liter, so you can float in about 6 or 7 of them easily, but upto 10 is very ok.
Make the tank planted, they like it.
seriously dont get too many as guppies breed like rabbits, you could start with a few of each sex and just breed your own!! get yourself a sucker also to keep your algie low.
you can have about 8 guppies maximum in a tank that size i wouldnt add more than about 3 at a time and then wait a day or two in between adding more so the bacteria in the tank can catch up with the waste being produced by the fish.
You need to check the surface area, there is a conversion for total lenght of fish based upon this.
It does not really matter how deep the tank is, or how many litres - surface area is what matters.
Pumping oxygen into it does allow you to keep more, but if you have a power cut, you will be in trouble.
Length of tank * Width = Water surface area / 40 cm (standard) Now, divide the size, or the average, of the fish you want to add.
Example:
90(cm)* 35 (cm) = 3150(cm2) / 40 = 79 / 5(cm) = 15 fish.
The key is to always understock as well - less fish, less waste. Say you had 14 fish instead of 18, then it obviously you won't get that extra waste in your tank. Always add fish sparingly when you start off your first aquarium
I'd say you could put about 4 Male Guppies in there.
The "1 inch of fish per gallon" rule isn't that accurate.
As long as you have good filtration, you'll be fine.
脽眉bbl毛拧
17 / 3.75 = 4.533333333... gallons. well you can get about 6 - 7 guppies. If I were you I would get 7 guppies. 2 male and 5 females. then you can have more fish. plus more babies.
Well i think most of the formulas given are just a guide. It depends not only on your tank size but your filter strength as well. 10 is a OK number.
1 cm of fish to 1 liter of water...
As guppies grow till about 3-4 cm, then you can have about 4 or 5 fish.
do not put a lot in *** they bred like rabbits you will get so many that you will not know what to do with them
Answers:
Consider it as 1 guppy per 2 liter, so you can float in about 6 or 7 of them easily, but upto 10 is very ok.
Make the tank planted, they like it.
seriously dont get too many as guppies breed like rabbits, you could start with a few of each sex and just breed your own!! get yourself a sucker also to keep your algie low.
you can have about 8 guppies maximum in a tank that size i wouldnt add more than about 3 at a time and then wait a day or two in between adding more so the bacteria in the tank can catch up with the waste being produced by the fish.
You need to check the surface area, there is a conversion for total lenght of fish based upon this.
It does not really matter how deep the tank is, or how many litres - surface area is what matters.
Pumping oxygen into it does allow you to keep more, but if you have a power cut, you will be in trouble.
Length of tank * Width = Water surface area / 40 cm (standard) Now, divide the size, or the average, of the fish you want to add.
Example:
90(cm)* 35 (cm) = 3150(cm2) / 40 = 79 / 5(cm) = 15 fish.
The key is to always understock as well - less fish, less waste. Say you had 14 fish instead of 18, then it obviously you won't get that extra waste in your tank. Always add fish sparingly when you start off your first aquarium
I'd say you could put about 4 Male Guppies in there.
The "1 inch of fish per gallon" rule isn't that accurate.
As long as you have good filtration, you'll be fine.
脽眉bbl毛拧
17 / 3.75 = 4.533333333... gallons. well you can get about 6 - 7 guppies. If I were you I would get 7 guppies. 2 male and 5 females. then you can have more fish. plus more babies.
Well i think most of the formulas given are just a guide. It depends not only on your tank size but your filter strength as well. 10 is a OK number.
1 cm of fish to 1 liter of water...
As guppies grow till about 3-4 cm, then you can have about 4 or 5 fish.
do not put a lot in *** they bred like rabbits you will get so many that you will not know what to do with them
How many guppies can I have in a tank 24 inches x 10 inches?
I've got plenty of air happening, and a filter plus two bottom feeders. Also, is it true that you need 2 females per male? And what temperature is best for them?
Answers:
bah! dont use the 1 inch of fish per gallon rule... it is terrible!!! There is a good website for calculating how much water you need per fish,
http://www.fishlore.com/conversioncalcul...
if you go to the bottom, you can use the calculator.
yes it is true you need at least 2 females per male. the males will constantly chase a female and the stress can kill her. if he can divide his effort between more than 1 female, it is less stress per female. the more the better, but only to the extent that you aren't overcrowding
4,673
2 males, let 'em have fun.
212
15 would be very good...
25.but they will not feel that comfy.
If you can, work out how many gallons that is- and then base the decision on a rule of 1.5 gallons per inch of fish, or 1 gallon per inch of fish if you plan to change the water often and regularly. Don't forget to use the length of the fish once it is full grown- for a guppy that's normally 1.5 inches, so you will need just over a gallon for each guppy.
And yes, you need at least two females per male, if not more. Otherwise the males can harrass the females to death trying to breed with them- if you have more females then their efforts are less concentrated and it's less stressful for the females. But don't forget, guppies breed like crazy- if you are not intending to breed them it can be easier just to get only males.
Answers:
bah! dont use the 1 inch of fish per gallon rule... it is terrible!!! There is a good website for calculating how much water you need per fish,
http://www.fishlore.com/conversioncalcul...
if you go to the bottom, you can use the calculator.
yes it is true you need at least 2 females per male. the males will constantly chase a female and the stress can kill her. if he can divide his effort between more than 1 female, it is less stress per female. the more the better, but only to the extent that you aren't overcrowding
4,673
2 males, let 'em have fun.
212
15 would be very good...
25.but they will not feel that comfy.
If you can, work out how many gallons that is- and then base the decision on a rule of 1.5 gallons per inch of fish, or 1 gallon per inch of fish if you plan to change the water often and regularly. Don't forget to use the length of the fish once it is full grown- for a guppy that's normally 1.5 inches, so you will need just over a gallon for each guppy.
And yes, you need at least two females per male, if not more. Otherwise the males can harrass the females to death trying to breed with them- if you have more females then their efforts are less concentrated and it's less stressful for the females. But don't forget, guppies breed like crazy- if you are not intending to breed them it can be easier just to get only males.
How many gph do I want?
in a 40 gallon tank?
Answers:
I would say a filter rated at 200 minimum. If you have many fish or any large fish going in the tank go up from there. A heavy fish load or several medium to large fish would need as much as double that or 400 GPH.
MM
wat does gph stand for?
thanxx 4 the points
=]
at least 200 Gallons per Hour preferably more
What does GPH stand for?
The most common rule-of-thumb regarding gph is 3-4 TANK cycles/hour. Keep in mind that most filters advertise the DRY gph, meaning without media, bags, etc. So adding this stuff will decrease the actual gph somewhat. It's much better to overshoot than underestimate, so I would go with about 160-200gph. All you should really need for filter media is the fine foam and coarse foam. Carbon help polish water and remove impurities, but loses its ability to do so in a very short amount of time. If you're using a canister filter, there are ceramic chips that are good also. The key is to have enough water flow to "clean" the water, but allow it enough contact time with the biological media to promote bacterial growth. This will help to more quickly convert the fish waste to less harmful forms.
A good rule of thumb is to buy a filter that turns over the water at least 3-5X/hr. So, for example, since you have a 40 gallon, you would need one that rated from 120-200 gph. Personally, I would buy one that was one step higher than the maximum here if you could afford it as most people tend to overfeed their fish (I'm not saying that you will), and so it gives the tank that extra kick in the filtration department.
As many as you can afford to buy. What Ryan said sounds good too.
Depends on the fish, too. For messy fish like oscars, the rule of thumb I've seen is turnover of 10 x per hour with hang-on-back filters and 3-5 x for canister filters and the like. But 5 x or so for more normal fish like tetras and stuff sounds reasonable. I always go up at least one size from what the box says. My biowheel (rated for 50 gal) does 200 gph on my 29 gal tetra tank and it seems more the adequate to me.
My recommendation is to always filter 5-10 times the tank volume per hour what ever the tank size. You can adjust this depending on stocking, activity level, and waste production of your fish. If using multiple filters, the combined gph of the output should equal 5-10 times the tank volume (not 5-10 times each). So for your tank, a total of 200-400 gph is suggested.
I have a large reef tank that is turning over 20+ times an hour...
The answer really is in what kind of animals are you going to keep in your 40g set-up? If it's a saltwater reef tank with SPS corals- you better shoot high, but if it's a tank with mainly fish (or all fish) that are smaller and/or delicate- you do not want to blow them around too much...
Hope this helps!
I've always attempted to achieve 10x/hour water circulation. In your case that would be 400gph. That would allow some extra bioload just in case u happened to have one fish too many in the tank. Penguins or an AquaClear would be a nice choice for that tank.
Depends on what you're planning on keeping?
If my Seahorse tank was turning 8 to 20x the volume of the tank I WOULDN"T HAVE SEAHORSES ANYMORE.LOL
My REEF tank turns about 20X.
For Large fish or fish from fast rivers you can go to 10-15X
For Guppies this will probably blow them away or suck them out of your tank.
Get an adjustable filter and adjustable powerhead and play With them until you get the MAX flow that won't kill your fish and will keep them happy.
The powerhead can be placed where the current will keep the crap suspended in the water until the filter picks it up.
What are we talking about here. Everyones assumed a filter which you really dont have to look at GPH most brands will say its meant for this aquarium(if your tight on cash get a 40 gallon filter if not try for a 55 or 60). Now if its a pump it all depends on how much of a current you want flowing through your tank. If its a UV sterilizer it depends on the wattage. For mine (9watts) i go down to 45 gallons per hour to kill parasites. Please specify though i think its a filter in which case you have good answers already.
Answers:
I would say a filter rated at 200 minimum. If you have many fish or any large fish going in the tank go up from there. A heavy fish load or several medium to large fish would need as much as double that or 400 GPH.
MM
wat does gph stand for?
thanxx 4 the points
=]
at least 200 Gallons per Hour preferably more
What does GPH stand for?
The most common rule-of-thumb regarding gph is 3-4 TANK cycles/hour. Keep in mind that most filters advertise the DRY gph, meaning without media, bags, etc. So adding this stuff will decrease the actual gph somewhat. It's much better to overshoot than underestimate, so I would go with about 160-200gph. All you should really need for filter media is the fine foam and coarse foam. Carbon help polish water and remove impurities, but loses its ability to do so in a very short amount of time. If you're using a canister filter, there are ceramic chips that are good also. The key is to have enough water flow to "clean" the water, but allow it enough contact time with the biological media to promote bacterial growth. This will help to more quickly convert the fish waste to less harmful forms.
A good rule of thumb is to buy a filter that turns over the water at least 3-5X/hr. So, for example, since you have a 40 gallon, you would need one that rated from 120-200 gph. Personally, I would buy one that was one step higher than the maximum here if you could afford it as most people tend to overfeed their fish (I'm not saying that you will), and so it gives the tank that extra kick in the filtration department.
As many as you can afford to buy. What Ryan said sounds good too.
Depends on the fish, too. For messy fish like oscars, the rule of thumb I've seen is turnover of 10 x per hour with hang-on-back filters and 3-5 x for canister filters and the like. But 5 x or so for more normal fish like tetras and stuff sounds reasonable. I always go up at least one size from what the box says. My biowheel (rated for 50 gal) does 200 gph on my 29 gal tetra tank and it seems more the adequate to me.
My recommendation is to always filter 5-10 times the tank volume per hour what ever the tank size. You can adjust this depending on stocking, activity level, and waste production of your fish. If using multiple filters, the combined gph of the output should equal 5-10 times the tank volume (not 5-10 times each). So for your tank, a total of 200-400 gph is suggested.
I have a large reef tank that is turning over 20+ times an hour...
The answer really is in what kind of animals are you going to keep in your 40g set-up? If it's a saltwater reef tank with SPS corals- you better shoot high, but if it's a tank with mainly fish (or all fish) that are smaller and/or delicate- you do not want to blow them around too much...
Hope this helps!
I've always attempted to achieve 10x/hour water circulation. In your case that would be 400gph. That would allow some extra bioload just in case u happened to have one fish too many in the tank. Penguins or an AquaClear would be a nice choice for that tank.
Depends on what you're planning on keeping?
If my Seahorse tank was turning 8 to 20x the volume of the tank I WOULDN"T HAVE SEAHORSES ANYMORE.LOL
My REEF tank turns about 20X.
For Large fish or fish from fast rivers you can go to 10-15X
For Guppies this will probably blow them away or suck them out of your tank.
Get an adjustable filter and adjustable powerhead and play With them until you get the MAX flow that won't kill your fish and will keep them happy.
The powerhead can be placed where the current will keep the crap suspended in the water until the filter picks it up.
What are we talking about here. Everyones assumed a filter which you really dont have to look at GPH most brands will say its meant for this aquarium(if your tight on cash get a 40 gallon filter if not try for a 55 or 60). Now if its a pump it all depends on how much of a current you want flowing through your tank. If its a UV sterilizer it depends on the wattage. For mine (9watts) i go down to 45 gallons per hour to kill parasites. Please specify though i think its a filter in which case you have good answers already.
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