Any tips on treating hole in the head? I've read many places that hexamita is pretty much a bogus reason why they get it, that it depends mostly on water quality/nutrition.. He had it when I got him about a month and half ago (didn't realize he had it until I brought him home). My water conditions have been perfect (ammonia=0 nitrite=0 nitrates always under 20, currently 10). I recently stopped feeding anything but HBH Oscar growth food. Last night I added 1 TBS of salt per 5 gallons and raised the temp to 80-82 degrees. Anything else I can do? He still has a good appetite.