Any problems with having a lawnmower blenny added to my tank? 50 gal long, 100lbs LR, 3" LS , 1 large yellow-head sleeper goby, 2 scooter blennies, 2 fals percs, 1 royal gramma, 1 serpent star, 1 chocolate chip star, 1 cleaner shrimp, 3 pepperment shrimp, various hermits and snails Also, what about an emerald crab?