i would suspect that it would be the hermits as they do this when they outgrow their shell, but be carefull with the coral banded shrimp because if he is not well fed he might do this as well.
Would like know if anyone has a 24 inch t5ho reflector to retrofit laying around they could sell me. also looking for about 5-10 lbs of sand (live or dry doesn't matter) if any one has some to sell. Preferably local around northern NJ. thnx.