Isn't the prazipro internal parasite? If not where would i obtain hexamita med ?Got something against internal protozoan parasites? (Hexamita meds work against those, too.)
If it's not that either I wouldn't know what to use. You say they got picked on quite a lot? Could be opportunistic bacteria, then.
It isn't heartless; I am aware of the cost and some of the medicine i already had on hand. Mostly i view it as an 'experiment' to try to find a cure. Right now the fish has a strong appetite and the poop is black so I'm reluctant to euthanize him. I suppose if he shows strong distress (have trouble swimming; stops eating; ...) I will go that route but right now he was strong enough to chase a female out of the pail (and bite off her tail in the progress - this was last week). Her tail has mostly regrown now that i moved her back to the main tank. I'm just a bit at a loss what is wrong with the fish. I've done a lot of reading that indicate stress; bacteria and parasite can cause this but no real way to identify the root issue.I'm sorry if I appear heartless, but it seems you have spent a lot of money on trying to save this fish, with no apparent success. You might consider it time to "put it out of its misery".