The Planted Tank Forum - View Single Post - what happens to the Ph at nite??
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post #3 of (permalink) Old 01-26-2003, 09:43 PM
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Join Date: Oct 2002
Location: Lebanon, CT
Posts: 4,939
Your PH is not what is giving you a fish kill... it would have to be a super drastic PH swing to do will stress them into disease but it usually will not kill overnight...

I do not understand what you mean by CO2 shutoff ? In any case (disconnecting/solenoid) you should never shut it down...the plants will take care of your PH if CO2 is controlled correctly.

I would look to ammonia spikes by way of damaged bacteria? A 15 gallon tank can be tricky with quick changes...Have you cleaned out your filter too well ? Or are you overfeeding this tank and the bacteria cannot keep up?
Test for Nitrites,Nitrates, Ammonia and get precise readings...
Ammonia is the only thing I know of that kills that fast.

Something in that water aint right ...
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