Ready4Reef
Member
Emeralds will also pick at the bases of corals, looking for algae, etc., so the crab may not have been doing any harm, other than trying to clean things up.
The LFS store did mention that also. Will see how it does without him for a while. I'm building a good relationship with the LFS and they gave me a credit for the crab which was nice.
For now my CUC will be down to 3 red hermit crabs, 4 astrea snails, and 2 nassarrius (sp?) snails.