Noticed my Oscar showing signs of HITH. my water perameters are near perfect, 0 ammo/0 nitrite/ under 15 ppm nitrate. 25-50% WC weekly. I'm on a well and the water is run threw a softening system. PH 7.6ish atm. he gets pellets daily and feeders a few times a week. I feed Hikari Exel, and HIkari Staple to him. frozen bloodworms here and there. I see no typical signs of worms, or holes, so I don't think it's parasite induced. the "skin" ontop of his head seems to be almost pulling back from the flesh in about 3 places. there is no sign of infection. I'm pretty stumped atm. he's a very active and bright eyed and bushy tailed fish otherwise, and the 3 fire eels and needlenose in the tank are all sassy. though one of the eels did stop eating for a few weeks. but is back to eating like a horse. He's almost pure white, can genetics cause this? any imiput would be helpful or suggestions as to what I can try to "cure" this? I'm boggled.. he's also approx 6" and has grown fast. I treated the tank w/ melafix so far to inhibit any potential infection. But I'm not sure where to even start with trying ot fix this issue. I've already poured over the disease section and am stumped.