This package is ideal for reef aquariums up to 50 gallons. It contains a carefully selected mix of detritivores designed to maximize biodiversity. By utilizing these cleaning organisms, and good overall husbandry practices, aquariusts will minimize their detritus cleaning responsibilities. It contains 1 Sand Sifting Star, 2 Queen Conchs, 2 Fighting Conchs, 10 Super Tongan Nassarius Snails, 10 Cerith Snails, and 1 Banded Serpent Star. For larger aquariums just order multiple quantities of this package accordingly.