Hi, I'm a newbie with a question. A week ago yesterday we brought home an 18" red-tail catfish (yah, I know the responsibility involved). We're working on plans for an indoor pond for him but in the mean time he's in a 150 gallon tank. A couple of days ago he stopped eating and acting very lathargic. He would sometimes act like he iched. My trusted LFS said to treat for ick although nothing was visable. I treated with QuickCure and yesterday morning did a 50% water change. He acted no different. He (Felix by the way) has a V shaped area behind each gill that looks like the skin is wrinkled. About 3 this morning I treated the tank with Melafix. He's swimming now but still hasn't eaten his fish. He's in a 150 gallon tank with 2 Emporer 400s, a magnum 350 and a Filstar XP3. Ammonia 0, Nitrite 0, Nitrate 20 and PH 8.4. Sorry that this is so long, but my husband is really worried about him.