250 ml and 500 ml bottle caps are 5 ml
Designed as a more accurate alternative to chemical test kits
Simple one-button operation
installs easily with magnetic base
They come in three different sizes and 5 colors
Brightwell Zooplanktōs-S - Zooplankton (Small) 50-300 micron Size:500ml 250 ml and 500 ml50 300m Zooplankton Suspension for Fishes, Stony Corals, Clams, and Other Filter Feeders Overview Provides zooplankton and fully digestible, unhatched eggs ranging in size from 50 300m. Ideally sized for many stony corals, clams, sponges, tunicates, tube worms, larvalcrustaceans, juvenile fishes, and adult planktivorous and microinvertebrate predatoryfishes. Formulated to provide over four thousand prey per ml. Does not require refrigeration.