I have not treating my fish w/hyposalinity yet. Let's me make it clear. I have some dragon wrasses and a Sailfin, Singapore tang. The sailfin and tang have ick but the wrasses is fine. I know my water has ick. Shouldn't I remove all the fish to hospital tank or just move the sailfin and tang. And the ick will be died off if the SG at 1.022 with no fish in it??