The Wonder Shell is a scallop-shaped mineral block that slowly dissolves in aquarium water to release calcium, magnesium, and other trace minerals fish and invertebrates need. As it dissolves, it also removes chlorine and chloramine from tap water and helps clear cloudy conditions.

Made from all-natural minerals, the shell oxygenates and aerates the water while neutralizing harmful acids that can build up over time. It's especially useful for tanks with snails, shrimp, or turtles, giving them an easily available source of calcium for healthy shell growth.

This pack includes 3 Small shells, each sized for bowls and tanks up to about 1 gallon. Replace a shell once it has fully dissolved.