Phytoplankton enriched L-strain rotifers, cultured clean and shipped dense. The classic first food for breeding projects and a favorite snack for corals and small planktivores. Everything is cultured in house in Vermilion, Ohio and bottled fresh the morning it ships. Orders go out Monday through Wednesday only so nothing sits with a carrier over the weekend. 100% live arrival guarantee, if anything shows up DOA I reship it free, no photos or claim forms needed.