Well I'm glad to say that the tetracycline worked and the gourami will be returning to his friends in the main tank tomorrow. The blackened part eventually fell of and isn't red anymore. Man, that tetracycline really turned the water red; it said it would and they weren't kidding. As for crazee's comment, I thought that myself so from now on I'll be buying from a place called the Aviarium. They're half fish, half birds and the owners seem very smart about everything. Heck, the lady rattled off the dimensions of practically every aquarium I asked about on one visit. Anyway, I'm glad I didn't return the fish to the store before trying to treat him.