Valonia and Emerald Crabs

[Seriak]

I have two emeralds that ate all my valonia right quick. I have not seen a single one since I added them. The crabs now only come out at night and eat pretty much anything I put in the tank. I see them picking at the rock everywhere. They have been with me for almost 8 months now. I actually saw a tug of war for a silverside between a foot long bristle worm, a emerald crab, and a cleaner shrimp once.

Chris