They are somewhat tolerant of each other in my experience. Maybe a little more cannibalistic than ghosts. I always kept them together, but I always lost 1 or 2.
I never had any cannibalism with mine but I only kept a few generations and small numbers. If you give enough space and constant food you shouldn't have an issue keeping them communally.
I separate them at L3/L4. I have kept the males communally, athough I had quite a few instances of cannibalism during molts this generation. I have kept females individually though.