1 - 2µm Phytoplankton Suspension for Soft Corals, Clams, Sponges, and Other Filter-Feeders Overview Provides phytoplankton ranging in size from 1 - 2µm. Ideally-sized for many soft corals, clams, sponges, tunicates, tube worms, and larval invertebrates. Formulated to provide over 1-billion phytoplankton cells per ml. Does not require refrigeration. Supplemented with a proprietary amino acid to aid in coloration of invertebrates. Formulated by a marine scientist.