HITH doesn't happen over night. That's a scratch, a parasite, or something like that. I would keep the salt at 1 or two tsp per gallon, and maybe add melafix. It's worthless against bacteria, but IMO aids in healing.
75 is room temp. I asked some LFS and they both said they have no idea if that type of fish can get hith but said, Cuz how fast it happen it must have been something else. and showed me some fish with HIth and the holes look bigger then mine. So we ruled out HITH. The only meds i have around are mardel CopperSafe.... on the back it says symptoms parasite. But most of the bottles say worms flashing and heavy breathing. His not doing any of those. His just norm... 0.0 heh or should i just salt the tank?
I wanta treat this for some time before he goes back into the 240 I might put heat back in the tank. Cuz he eats alot more and i kinda want him bigger.