Can too high of KH kill fish? - The Planted Tank Forum
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post #1 of 2 (permalink) Old 07-29-2010, 05:58 AM Thread Starter
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Can too high of KH kill fish?

So i've been losing a lot of fish lately. A lot. Nitrites/nitrates/ammonia are all fine. However, my KH is over 300 ppm. Could this be the culprit? If so, how do I fix it?

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post #2 of 2 (permalink) Old 07-29-2010, 09:14 AM
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That does sound extremely high for a FW planted tank, but I don't know if that's you actual problem.

Test your source water, and see what that is. I suspect it has a high KH to start with. It also might be worth trying another brand of test kit.

You can lower it by doing partial water changes using distilled or RO/DI water. For a small tank you can just buy that at your local store. For a large tank, you are better off getting an RO/DI unit.
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