I just wanted to say that emerald crabs can attack other animals. I was at the LFS yesterday, and I was just about to buy a red brittle star. Then, as I was watching the starfish, it got attacked by several emerald crabs. It wasn't just one bad crab either, it was 3 or 4. The starfish was fine before the crabs got to it, but even by the time I reached in and separated them, the starfish was already pretty beat up. It wasn't anything the star couldn't quickly heal from, but still. I was wondering if I should get some emerald crabs but after seeing that I decided I didn't need anything that did that in my tank.
kris