Hmmm? I don't believe he's got ammonia burn because as I'm looking at him right now, he's swimming around rather actively. When I had taken the pic, I later realized that I left the heater unplugged after a wc. Now with the heater on and a powerhead, seems happy. I'm trying to train him to eat market prawn whereas the the lfs who had him before me was feeding him live goldfish. But, I am open to hearing why you believe he might have ammonia burn. I really want to make sure he will do fine in my tank.