How do i get fish tank water that has to much alkaline in it to not have to much.?

Answers:
What do you classify as too much? Most fish can live happily in a wide range of PH. Attempting to correct it will do more harm than good. If you are attempting to use RO water you will have a daily battle to attempt to keep it at that level. Testing every day. As was mentioned above me, peat in a nylon bag will keep your ph at a lower level. Bog woods added for decoration to your tank will also lower your PH and keep it stable. Having a stable PH is more important than trying to adjust it. Unless you are willing to test the PH daily and ready to make adjustments immediately I would suggest Peat or bogwood. this will slowly bring the PH down and keep it that way even when you have done water changes.

Just remember stability is safe for your fish, playing with the natural order of your water and fluxing the PH is not healthy for your fish.

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The pet store will have a chemical you can put in the tank.

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As other poster mentioned, the pet store has some chemicals that would help.

If you are keeping something like Discus or Killies, or breeding egglayers, consider getting a reverse osmosis unit. Works much better and at much less cost than those chemicals over time. You can use a unit either for humans or for fish-whichever is more practical for you. You don't want your water 100% reverse osmosis, but maybe 50%.

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The best way to lower alkalinity in a tank is by diluting your water with either distilled or R/O water. Chemicals you can buy at pet shops usually send the water on a roller coaster ride of up and down swings and are difficult at best to use effectively. Unless you are keeping / breeding really delicate species of fish, it's best not to worry with it or try to change it honestly. By far most fish will adjust.

MM

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Rather than chemicals, I'd suggest mixing your water with RO water (you can get this at larger supermarkets and Super WalMart for about $.25 where I live). This will dilute the buffering agents from your water source. You can also try adding some peat moss in a mesh bag to your filter - the acidity from the peat will neutralize some of the alkalinity.

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I agree, stay away from the chemicals, just end up causing more problems. The RO water is a good idea, as well as the peat moss.
But first, do you have any rocks in the tank? Limestone will increase the ph/alkalinity in a tank. If that's the case, just remove them and that should take care of it.

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boil and cool the water. add a drop of lime to it.

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In order to bring the Ph down I use peat moss that I buy at a garden center. I put it in a nylon bag, tie it, rinse it, then put it into my filter. It does color the water but it works. I use this only for my South American Cichlids. I also test any rocks before I put them into that tank to test for reactivity to acid.

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There are two suggestions from two different people that I think you should use first use reverse osmosis water, secondly use peat moss, but don't use the peat moss from nursery unless it absolutely DOES NOT have pesticides in it.

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You can get some pH stuff to lower down alkalinity of your water. I wouldn't worry about it if your fish are moslty Cichlids. They leve in alkaline watre..Well... most of them do.