so i have no idea what went wrong. yes the fish had ich for sure so after weighing the options we decided to do the hypo salinity. we started to see what i thought was the ich worsen at about 18ppt and when we got down to the 12ppt it looked like the fish were sunburned and there slime coat was flaking off we have 3 different tanks going right now for QT
and we have checked the levels every day sometimes twice a day and everything has come back normal. every time we check. so i don't know what went wrong but i lost all 3 tangs
my powder brown, disjardin, and blue eyed kole tang but everyone else is fine. i don't get it? anyone have anything or any thoughts about the situation let me know the heni butterfly, 2 goby, mated O. clowns are all fine and some of them were in the same tanks as the tangs. i am upset that they died but i guess this gives me a new chance to think about some different fish to start with.