I have a cyphastrea (or plating monti... not sure) that, over the last 4 months has nearly covered its plug and is now reaching the rock. I looked at it this morning and saw that most of the growth was gone! I then noticed a small green crab just perched on top. The little @*$)! I scooped him out and dumped him in another tank. Has anyone ever had a coral eating crab?