I have a 3" blood parrot and he is getting black marks all over his head and body. He had a small black spot on his head when I got him but now there's several spots on his body. Anyone have an idea of what this might be? All the other fish (2 black convicts, 2 green terrors, a JD, Bala shark and Pictus) are fine. Tested water its fine. I'd post a pic but don't know how. Thanks in advance. There in a 75 gal.