wow i was reading and reading and theni did some more reading, then that expains why the other fish dont have anything....but i was lookin at some pics of ich, and it just doesnt look like that, but from what it says about seurgonfishes and tangs being more prone to that disease more suceptible to ich, i have a tendency to lean more towards it....i think i am gonna setup a quarentine tank try it out....i think i am gonna have a promblem trying to get these tangs out of my tank...i need a trap....HEY BMAC, i dont wanna sell you an infected fish, but if you still want it, you should read about that ich thing before you go ahead and get this powder blue..i know its a great deal but you dont want to infect other fish and that great deal turns to an expensive deal, and have me to blame.im sure ill talk to you...i gotta get a trap and a tank...oh one more question about this ich, i know diatom powder is really good for removing parasites from the water, shoudl i go ahead and setup a hot magnum with micron filters and diatom powder will this remove ich? id ont have a quarentine tank so its gonna take me a week to set one up...im walkin out to ed now i got a 202 real and rod, im goin fishin....who do ou think will take the bait first?lol