Phytoplankton are a natural food for many filter feeding invertebrates. If you have a young clam, this is very beneficial. Dosing phytoplankton provides a nutritional boost for the clams, filter-feeding corals and other beneficial invertebrates like copepod in their marine aquarium Each sealed pouch is 500ml. Pure strain of Nannochloropsis Oculata. $7 per 500ml pouch. Self collect at West Coast Gardens Sent from Singapore Reef Club mobile app