Brightwell Aquatics ZooPlanktos-S, 50-300 Micron zooplankton Suspension for Fishes, Stony Corals, Clams, Other Filter-feeders, 500ml 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