Brightwell Aquatics ZooPlanktos-M, 500-1K micron zooplankton suspension for fishes, stony corals, clams, and other filter-feeders, 250ml Safe and effective to increase Zooplanktos in reef aquariums Fully digestible, Provides zooplankton and formulated to provide over four-thousand per ml Excellent for soft corals, clams, tunicates, larval crustaceans, and adult planktivorous