I've been adding Melafix since it happened so I'll just continue to do that for the next few days. And I'll definately keep an eye out for who might have done it. It obviously could have been any of the fish (although I doubt that it was one of the other cories or the oto cat). The convict seems to ...

Hmm, I don't know. The Convict is an outcast, it's only in the tank because it's mate tried to kill him, he pretty much keeps to himself. The Rams are also pretty quiet. But obviously there's no way to know for sure what happened. Anyways, that still doesn't help me figure out what I should do.

I'll list all of the standard info first....

Water Parameters
-Temperature: 78-80 degrees F
-PH: 7.0
-Ammonia/Nitrites: 0
-Nitrates: No higher than 20

Tank Info
-Size: 40g
-Length of time running: almost 1 year
-Substrate: 1/2 of smooth gravel
-Decorations: Several caves and fake plants
-Filter ...