came home from work and 1 of my RB's was dead between the filter and thermometer. I dont know what killed him tho. It seemed as if he was left out of the group (posted after i first got them that there was an outcast of the group). I also noticed yesterday that he had a nip out of his tail but i didnt know if it was always there and i didnt notice it. I also added 2 crayfish and 2 snails to the tank yesterday so im not sure if the crayfish got him, the piranhas seemed way to fast for the crayfish. They are about the same size so i dont think their claws could even hurt the RB's yet. there are also sizable chunks of meat missing from him and the others are just school as normal. who do you think is the culprit?