i have a butterfly fish then it looks like that the tail was falling off...and it was hard for it to swim..i lost some fishes from cloudy eye and i dont want to loose this one...i am using MELAFIX for 7 consecutive days then after that i saw some
ICH at my tang, then i continue using MELAFIX again and my tang got no ICH, but now....it was my butterfly battling from something that i dont know what it is...
can someone help me

everything is fine when it comes to the water quality, temp and
salinity.