i got one as a hitchicker. i barely ever see it. only with a flashlight at night if i shine it into a hole in the rock. i think they are cool, but kinda a waste of money if you dont have a shirmp goby paired with it. Pistole shrimp are almost blind, they use the gobies as their eyes, touching them with their antennae to tell when they rush back into the hole. without one, youd never see it. they can also become a neusence cause they dig a lot. mine lives in live rock, so has no need to dig. but if you have corals in the sand, youd have the brush them off.