1 - 30µm Phytoplankton Suspension for Soft Corals, Clams, Sponges, and Other Filter-Feeders Overview Provides 6 types of phytoplankton ranging in size from1 - 30µm. Ideally-sized for many soft corals, clams, sponges, tunicates, tube worms, bryozoans, larval crustaceans, and juvenile fishes. Formulated to provide over 200-million 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.