Seachem had a booth full of goodies at MACNA this year, with one of their latest offerings being a pair of plankton-based additives geared for feeding corals. Their fairly new Reef Zooplankton and Phytoplankton are concentrated blends of different plankton strains, with each product providing all of the fatty acids, proteins, vitamins, and carotenoids that growing corals need. The particle size of the Zooplankton is 12.5-500µm, while the Phyto is 1-20µm, meaning the use of both products will give you the particle range that just about every filter feeding can handle. Neither of the products have to be refrigerated, and according to the rep we spoke with, the cell walls of every particle of plankton has been removed to decrease the amount of energy a coral must expend in order to digest the products.
Both the Zooplankton and Phytoplankton are currently available to hobbyists. An additional photo can be seen below, along with how Seachem claims these two new products are different than other brands.
According to Seachem, the Reef Phytoplankton and Zooplankton products are different than other products because they are each enhanced to increase the bioavailability of important nutrients, allowing corals to expend less energy to derive the nutritional benefit. This abundance of nutrients is aided by the fact that cell walls have been basically pre-digested, as mentioned above.