This invertebrate food replicates the special biogenic suspended matter "marine snow" found in natural seawater. Marine snow is an important part of the food chain in marine ecosystems. Now it can be a part of home reef aquariums too! Contains natural components of marine snow, including zooplankton, phytoplankton, and particulate and dissolved organic material, and more to provide superb nutrition for filter-feeding marine invertebrates. 16 oz.