I bought 5 small cons yesterday, 2m 3f, my goal is for them to pair off and breed for a safe live food source for my oscars, I have found them to be quite entertaining, I have one male that was very dark, almost black, last night he was about the same "normal" color like the others..tonight he has staked out a territory and is once again very dark..is there any signifigance to the dark coloring?