Hi all. I'm going to pick up a new oranda at the pet store, but I wanted to be sure he was okay. the fish had ammonia burn but is healing nicely except some black spots on his wens (and one on his body). these are not normal black coloration, and look like someone took a felt tip pen and put little dots on him. is this part of the ammonia burn, or could it be something bacterial? any help you have to offer would be great. thanks!