I've got a clown with bad ich right now,. and no, i'm not new and did recognize it early other fish had it first, and ammo and nitrite have never been above 0 in recent memory and nitrate is very, very low, only trace if any judging by color strip.
No idea what to do... see other thread ("I know this is a hard one...") esp pages 3 and 4.
Short version: I'm on round 2 of maracide (day 7, water change after day 5), and on day 2 of maracyn II. All other fish (dwarf gouramis, platies, siamese algae eater, otos, dwarf bristlenose pleco) all look fine. I'd earlier lost 2 platies, 2 dwarf gouramis and one clown -- earlier meaning 2 weeks ago -- for no apparent reason, no visible white spots, no wounds, no weird behavior. Just boom, gone. May have had ich not visible, in gills. Who knows.
Anyway, there's ich in there now and it's stubborn and spreading on the clown.
Anyone who has successfully treated a clown with ich in a community tank and can help, ideas would be most welcome! But please read the other thread first as there is history there and other questions are probably already addressed there.