Is the verdict out on these guys yet? I was led to believe tht these guys are an asset to a reef set up. In particular with their means of controlling bubble algae. I have however been noticing some damage in my reef. Sarfish limb severed and fish damage. The culprits are either the emerald crsb or puple reef lobster. I seem to think that it is the lobster. In any case I am curious to know it i can be reassured that the crabs are fine in my set up, particularily with all my beatiful & unusual forms of mushroom anenomes. Thanks TT.