I have had 2 oscars for about 10 months, and one of them has been developing some sort of holes in his head,one under his eye, and one on the lower right side of his face. I noticed the one under his eye when he was a juvie, i cant remember hen i noticed the other. I am sure this is not HITH, because the water has pretty much always been good in his tank, and no matter how clean i keep it, the hole will not subside. I am wondering if this could be bacterial,or parasitic? any help is appreciated.
the tank is 105 gallons, the filtration is one rena xp4, and one cascade 1000.
the tank is 105 gallons, the filtration is one rena xp4, and one cascade 1000.