Dimart Super Magical High Simulation Resin Sea Mermaid Coral Aquarium Action-Air Ornament for Fish Tank Grey + Orange Mermaid resin aquarium ornament, interesting and hiding places for your fish. Made of non-toxic resin. Safe for fish. It can connect air pump (not included) to creat more air the aquarium needed. Harmless to all fish, fits both salt water and fresh water. Decorate your aquarium all the time with minimum maintenance