They cannibalize. Keep them well fed and give them enough room to spread out and it should not be a problem.
They will eat each other though when their young, it's just what they do. You can stop it if you really want 200+ babies by separating them in different tanks.
Their most at risk from killing each other when they just molted and are soft and vulnerable. If they get in a fight when their carapace is hard, the most damage they can do is snip off a limb or two which will grow back, Unless it is a really outnumbered fight.
Be aware that mating looks like a fight. Looks a lot like rape to me. Male holds down females claws in front of her face while she's on her back. The rest is self explanatory.