I don't have a photo but I have had the same four red eye tetras for about 4 months now. House mates are a Blue gourami, a pink kissing gourami and a chinese algae eater, and two ballon guppies. One of my tetras has developed a kind of white patch on his side. He is not acting differently and has had it about a week. I first thought someone took a nibbl;e but now am thinking it might be something else. It isn't red or yukky looking jsut like anotherfish took a nibble. Anyone have anything liek this haapen to their fish?