I got home from a funeral, I was gone for 2 days and they went un-fed, I get back and look at my favorite fish Fatty(a BP) and he has a big black blotch on top of his head, I can get a picture but it would be hard.
No I got him intentionally because in the store he was the boss of the tank and he's bigger then my convict and FM, he's the boss of this tank, he has 2 caves that he has claimed as his own, could the lights being left on for over 24 hours have caused it? I had to run out the door as fast as possible so I didn't have much time to leave people in instructions.
Black patches can be ammonia burns that are healing, so check your stats.