cpsammich - they CAN be cannibalistic at this size, but not always... Generally 2 will not have this issue if they are fed enough, and since they get krill pellets every other day, and have a small school of feeder guppies, there should be no need for cannibalism, not to mention they were raised in tanks with several others... They lay on eachother all the time, but have yet to nip at eachother to my knowledge, though generally they are on opposite sides of the tank as they have a different preference for their hides... Oddly, the white one (Falcor) prefers to be on the sand under some plants, and the black one (Toothless) prefers to be on or by the giant rock structure in the tank... Falcor is good at catching guppies, Toothless needs some more practice with it... He jumps the gun quite a bit.