TWO OF MY FISH DEVELOPED "ICH" AND THANKS TO THIS WE-SITE I LEARNED REAL QUICK TO RECOGNISE IT, SALT SPOTS OF THEIR BODDIES...THE ANSWER, I USED "COPPER SAVE" ONLY ONCE AND TO MY SURPRISE, THE BLUE TANG HAD NO ICH WITHIN 3 DAYS...GOOD LUCK, SOME PEOPLE HERE SAY ALSO TO TRY HYPOSALINITY!!!