Aquarius OT6000 Coral Reef Decor is a recommended addition to the Ocean Treasures Collection Aquariums, OT6001, OT6002, OT6003, it also can be used in all other aquariums as well. This solid one piece, hand painted resin aquarium décor adds beauty to the Ocean Treasures themed aquariums. Safe for freshwater and saltwater aquariums it is the perfect addition and a must for your aquarium.