500 - 2Kµm Zooplankton Suspension for Fishes, Stony Corals, Clams, and Other Filter-Feeders Overview Provides zooplankton ranging in size from 500 - 2,000µm (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 incoloration of invertebrates and fishes. Formulated by a marine scientist.