Oh, so this is why we quarantine our new fish. It seems my month old Potters Angel Has brought some friends with him from Hawaii. Curiously its the Neon Gobie, the so called ich eater that has the most obvious trouble with the parasite. While I can't see it on the Angel he is scratching himself on the rocks. I know some have had bad experiences with Ich. but what did you find worked? I read of one treatment I was thinking of doing where you put all your fish in a quarantine tank and change 50% of the water every three days for two weeks. Cleaning the tank every time. Only adding them back to the display tank after 4 or 6 weeks, I can't remember which. Based on the life cycle of the parasite it seemed to make sense. Any comments or suggestions? Thanks, Darren Yes, although my tank is now full, next time I will quarantine.