hermit crabs vs. montipora

[bowkry]

Has any one had hermit crabs take over your montipora. Every morning I wake up and I find anywhere from 2 to 6 large hermit crabs, looks like eating my montipora. Some are blue leg some red and some strang gray one (I dont realy think I bought them but I dont know) But it has got to the point now the polips only open just a little bit. It looks like they are killing it. Its pretty big so a few crabs get on it a once. (about 8 in tall)