when i purchased my pair of emerold crabs the guy at the lfs mentioned that they eat coriline,but not much.this morning i woke to find one munching on some coriline,quite proficiantly I might add.I am one of those people that fight for coriline coverage ,it dosent come real eaisy in my tanks ,Am I about to get wiped out by these two emerold crabs or what,??? any one here care to give there experiance.