Brightwell Aquatics Zooplanktōs-L is a concentrated suspension of cladocerans, a group of zooplankton heavily preyed upon by various aquatic organisms because of their size.

The specific variety of cladocerans present in Zooplanktōs-L are rich in amino acids, omega-3 fatty acids, vitamins, and xanthophyll (a carotenoid pigment), making them of exceptional nutritional value to the organisms that they are consumed by. These cladocerans fall within the mesoplankton (200.0 – 2,000.0µm) class of plankton. They are the proper size for feeding many species of stony corals (large- and small-polyp), as well as clams and other bivalves, plumed worms (Christmas tree worms, feather dusters, etc.), larval crustaceans and bivalves, juvenile fishes, and the adults of planktivorous fishes (such as anthias, basslets, pseudochromids, dartfishes, chromis, etc.) and microinvertebrate-predators (such as mandarinfishes, some gobies, dwarf wrasses, etc.).