I spotted a small black spot on top of the head of my red Oscar today. It is hard to tell whether it's just a scratch or something else so I'm kind of freaking out at the moment. It is possible that he scratched himself on the rock or the hood since he does tend to jump during feeding time. Also, he doesn't appear stressed or sick. I bought him about 6 weeks ago and he's approx. 3.5'. Is it common for an oscar to get HITH that early? I don't know what they fed him at the LFS but his diet contains mainly Hiraki staple pellets, dried freeze shrimps, occasional blood worms and some spinach about once a week. The tiger oscar I got the same time does not have the same symptom. Could anybody with experience please tell me if I should worry?