Brightwell Aquatics PhytoGold-S, 4-10 micron phytoplankton suspension for soft corals, clams, sponges, and other filter-feeders, 500ml Effective in providing phytoplankton for soft corals and sponges Designed for soft corals, tube worms, clams, sponges, and larval invertebrates Formulated to provide over 75 million phytoplankton cells per ml