I respect everyones opinion so why cant everyone respect mine? Im not saying a UV sterilizer will wipe out the parasite as I clearly stated multiple times, and I've said that I would consider my tank to still carry the parasite even though I haven't seen the parasite in over a year. My tank was infested with ich, I cleared the tank for 8 weeks, put brand new fish from a copper treatment in the tank, and Ich reappeared again. I am not at quarantining fish because I lose many fish in the process. After my tank was reinfested with ich, I added a 36 watt UV sterilizer to the fish tank and the next day the ich spots retreated drastically and by the 4th day they were all gone on all of the fish. As I have said, the parasite is not gone, but my fish are doing amazing, I have kept a moorish for over a year now, as with a powder brown tang, blue hippo, purple tang and others and they all seem extremely happy, so please make sure you read all of the posts before you judge. I have tried pretty much everything to rid ich and the only one that worked for me was the UV sterilizer. I do not believe every tank has ich, but ich is too hard to get rid of, and too easy to re-introduce for me.