Feed him i bet hes really hungry!!! Lol thats great!! If you dont want him...i will give him a home lol...i think hes a GREAT addition to your tank though!!
I'm glad you figured him out! He seems cool I had 2 emerald crabs in my tank that I had bought to combat bubble algae and regular algae, until the day I saw him on my Toadstool Leather. I chased him away, but noticed that my coral was all slumped over and not happy anymore. Upon further investigation I realized there were HUGE chunks missing from his base! Looked like a freaking beaver had chewed up the base of him! Needless to say those evil jerks are gone out of my tank. (Dont worry I didnt kill them, I pulled them out and took them back to the Fish Store.)