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Discussion Starter #1
Hi everyone!

I have a 20g tank with four gardneri killifish, three guppies, five albino cories and three pigmy cories (as well as a few snails).

Last week, an albino cory died of ammonia poisoning, so I did a 20% water change each day the following three days. Tonight, about 6 or 7 days after the cory had died, I found a dead killi and a dead pigmy.

The killi had a hole in her stomach, and the pigmy was missing its tail fin, though neither has any signs of ammonia poisoning.

Does anyone know what's happening? If there is something wrong with my tank, I want to fix it before anything else dies.

Thank you!

Calvin
 

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I would start with an API freshwater test kit. Knowing the levels of pH ammonia, nitrite, and nitrate is very important to diagnosing problems.
 
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