Well the tank is now 3 months old and I just discovered this guy today in the live rock right up front. He is mottled gray and is hard to see against the rock. He is living in a hole in the rock and appears to be eating brown algae off the rock and seems pretty active during the day. Any Ideas what he is and if I should keep him? He looks like a slug with no shell, two antenae and one visible mouth and is 3/4 to 1 inch long.


