OK it is for sure now my emerald crab is eating coral! It has been picking at my birds nest and everyone I talked to said it was just picking for algae. I have been watching for a few days and tonight I could see him pulling polyps out and eating them on my birdsnest. I showed him off and when I came back a few hours later he was yanking on the red hairy acro I have and eating polyps again. I could see the polyps in its claw!! Anyone else seen this? I thought emeralds were reef safe. Might it be do to the fact that I have zero algae in the tank for him to eat? He seems to be just fine when I feed mysis shrimp. I tried catching him with my long tweezers. Failed! I got to get that little sucker!