If you dont want the fish, a lot of stores will let you give him back. But I have only three cories in a 20 or 25g tank and they do just fine. Then again, I don't know a lot about cories.
Like the others said, I think what happened was that your tank wasn't cycled and your tank's ammonia level spiked after around two weeks-- which was, coincidentally, the same time you brought your diseased cory. The high ammonia level stressed out the diseased cory as well as the other fish and so they all got sick.
I would go with your instincts. If you think your cory is doing fine on its own, then I would get maybe one or two more. If you really want more, get more.
Can you post a pic of your current cory if you want to know what it is? We might be able to help.
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Last edited by Cichlidsrule; 01-20-2008 at 04:55 PM.
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