The Aruba Plug N’ Play Rock Base is your way of bringing a piece of the ocean into your home. This base has pre-set holes that accept our artificial corals, which can be purchased separately. The natural rock color of this reef rock can be found on the nearest coast. You have the option of picking between four different encrusting sponge colors or no sponge color at all. This piece was designed to have an arch to give your fish a place to swim through.