The Penn Plax Aqua-Scaping 3 Piece Red Rock with Moss Set offers visual interest to your tank while reducing fish stress. This 3-piece set has the realistic look of red rocks with a unique shape in shades of red, and brown. The pieces are also finely-detailed with realistic looking moss. These aquarium ornaments serve two purposes, to add visual interest for humans but also acts as pass throughs for your fish. These stone replicas are perfect for cichlid tanks since this fish is territorial and must create their own space. These aquarium ornaments are made of quality resin and come with one large sized rock, one medium sized rock, and one small sized rock in the set. These ornaments are free-standing and double sided so they can be placed anywhere in your fish tank. Pair this set with other rocks to create a larger display. Coordinate these rocks with other aquarium decorations and plants to create a complete environment for your fish tank.