So a few days ago i shared some pictures of my shoal of discus (my pride and joy). A person commented saying “watch out for the peppering on the pigeon bloods face”. What does this mean? I mean, yes I’ve see lots of discus with black peppering spots on their face. Especially with pigeon bloods. Anyways... some of my fish “have it”, so what is it exactly? I expected it was just random coloration but is it not?