hairy crab.. grrrr

[Willow]

ok so i think i had 3 of these monsters in my tank that came in on my jakarta. a few days ago one of the smaller ones ended up in the sandbed in the morning dead. i belive it was the big bastage nailed him in the night. tonite i saw him sitting under my only frag trying to flip it over! i tryed to grab him with some tongs but ended up breaking off a good chunk of his claw. will he die or grow something bigger and badder and beat me with it?

edit.. yeah yeah i can't spell.