can u take the tang out,and put it into a quarintien tank by its self , if so, you can get rid of the ick by raising the tem p very slowly to 91 and i mean slow ly, while you do that, you want to lower the salinity to 22 or1.016 and do this very slowly as well one point and degree a day.once you have reach those perameters, leave the tang like that fot at leat 2 weeks your tang can handle the low salinity and high temp if done slowly . now as far as you reef tank ;;;; ick need a host fishost to survive , so with now host the ick will die off usually in 2 to 3 weeks . as far as chems for ick its a hit or miss usualy food like formular one WITH GARLICK SEEMS TO WORK