early this morning as i was turning on the lights on my tank i noticed something very peculiar. my normally lemon yellow auratus was a dark murky grey. I know that fish tone down their colors at night but 3 hours later he still hadnt changed back to his normal colors. i also noticed that the normally black lines on his lateral nerve had become a bright irridescent blue and that the grey color has almost turned to black under his ventral fin and gills. worried that something might be wrong with my water quality i checked and everything checked out optimally. Is it possible that it is changing sexes, because i know the male is black and blue? he is the only auratus in the tank atm ( mostly because he kills all others of the same species). whats going on here, is my fish a transexual or is something else going on?