ReefCreators is now offering concentrated guillard's F/2 fertilizer.The Nannochloropsis phytoplankton is one of the best live food sources for your copepods, amphipods, rotifers, and all other zooplankton cultures. With our F/2 concentrate you will be able to culture your own micro phytoplanktons, weather it be nannochloropsis, tetraselmis, or Isochrysis among others. Nannochloropsis is excellent for feeding any types of filter feeders as in brine shrimp, feather dusters, corals, sea fans, clams, scallops, coco worms, ect... This is a concentrated bottle and dosing is 1 ml per 2 liters. Shelf life is 6-8 months. Please store in a dark cool place. Starter culture is not included. This listing is for whats pictured, the fertilizer to grow your culture.