I tried hyposalinity and managed to drop down the level to 1.007 for 3 weeks then returned the level back to normal. Its been back to 1.027 for 3 days now and all of a sudden all the fish are re infected and the blue tang is not eating anymore. Can you guys tell me where I went wrong? I wouldnt mind doing this again but I am seriously thinking of using copper now since I think that is the faster way of killing ich. Also, the tank these fish were has 7 different shrimps. Ich can infect shrimp right? I am sure the free swimming ich has died now? Thanks