Crabs is crabs......they are opportunistic and take what is available to them......Ive never had any issues with my crabs and coral, but all hermits are covert operatives in an underwater terrorist cell known to be responsible for countless snail-jackings
....that being said I have several crabs in my tanks....Halloween, left-handed, scarlet, and blue-knuckled hermies in both tanks and pom poms and two different species of porcelain crabs in the small tank.......crabs are to interesting a critter not to have in a reef IMO.....
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260g mixed reef, 105g sump, water blaster 7000 return, Bubble King SM 300 skimmer, Aqua Controller Jr, 4 radions, 3 Tunze 6055s,1 tunze 6065, 2 Vortech MP40s, Vortech MP20, Tunze ATO, GHL SA2 doser, 2 TLF reactors (1 carbon, 1 rowa).
http://www.canreef.com/vbulletin/showthread.php?t=50034 . Tank Video here
http://www.vimeo.com/2304609 and here
http://www.vimeo.com/16591694