Brightwell Aquatics ZooPlanktos-M, 500 - 1K micron zooplankton suspension for fishes, stony corals, clams, and other filter-feeders, 2 Liter Provides zooplankton ranging in size from 500 - 1,000m (2mm) Ideally-sized for many stony corals, clams, tube worms, larval crustaceans, juvenile fishes, and adult planktivorous and microinvertebrate-predatory fishes Does not require refrigeration Supplemented with a proprietary amino acid to aid in coloration of invertebrates and fishes Formulated by a marine scientist