Zooplanktos L Zooplankton by Brightwell Aquatics provides zooplankton ranging in size from 500 - 2,000-µm (2-mm). Zooplanktos L is Highly-concentrated and ideally-sized for many stony corals, clams, sponges, tunicates, tube worms, larval crustaceans, juvenile fishes, and adult planktivorous and microinvertebrate-predatory fishes. It rich in amino acids, omega-3 fatty acids, vitamins, and xanthophylls (a carotenoid pigment), making them of exceptional nutritional value to the organisms that they are consumed by. Supplemented with a proprietary amino acid to aid in coloration of invertebrates and fishes. Does not require refrigeration.