Sunday morning i noticed one of my aros staying toward the bottom which is very unusual for them. A closer look revealed that a couple of fish were developing a body fungus . Not sure what happened the tank has been running for a year. Stock has not changed. The tank is on an auto changer which does 70g per day. When it does this the temp only drops 2 degrees. Ive been adding salt daily. Melafix daily. Temp at 83-84. And set the auto changer to do an additional 50g every other day at separate times not to drop the temp. Most fish have eaten yesterday but i have a couple of expensive not easily replacable fish that seem to be getting hit harder than others. The tank is a 750g. And there is one ray in the mix as well. Any suggestions would be appreciated
