Hermit Crabs, Friend or Foe?

[landshark]

I have kept Hermits in my reef aquarium for the last 3 years. The only problem I have with them is that they will knock frags over, but so do snails. Secure your frags to the rockwork with eg.(epoxy putty) and you won't have this problem. I also keep snails in the system, and occassionally one will die unproven at the claws of a hermit. I think hermits are cool, but I only keep a couple in a 55 gallon and I get rid of them for smaller one's when they get tooo large.