Just a question i thought of over the weekend talking to one of the workers at my lfs. He has a 265 with at least 30 fish....10 of em being tangs. Hippos, clown tang, damn near everything but a sohol. We both get fish, equipment, food, everything from fish store he works at and never gets ich. He doesnt use quarantine either. Only difference is he uses instant ocean salt mix and i use tropic marin. I do everything by the book so there arent any newbie mistakes....could it be the salt? I thought it was an interesting theory.