I have had my nano running for 6 months I recently added a colony of polyps on a huge piece of live rock. I noticed tonight a crab it was small, about 1/2 an inch it kinda looked like live rock it had claws and was picking algae off my LR and eating it (which is good). I couldnt get a good pic but the only other identifying mark was a red almost diamond in the middle of its back, other then that it was white all over and blended in very well. Any ideas?
