Not all corals consume phytoplankton, but there are plenty that do. NPS corals, as well as gorgornians and some soft corals, will consume phytoplankton. There are a number of public aquariums and home hobbyists that use phytoplankton routinely to feed not only to corals, but zooplankton and non-photosynthetic bivalves (flame scallop, thorny oyster, etc.) as well.
Just to give you an idea of how we do things at Reed Mariculture, I would like to discuss why our non-viable concentrates are different than all the live algae products found on the market. First off, the phytoplankton doesn't need to be alive to valuable to animals, just like mysis, brine shrimp, copepods, worms, etc. don't need to be alive to be consumed by freshwater and marine animals; however, the cell walls, or membranes, need to be intact. A non-viable, intact cell contains all the nutritional qualities of a living cell. The majority of our single-species and multi-species products are non-viable (not alive), with our Phyto-Feast Live as the only exception. We provide highly concentrated products to people that are working in shellfish aquaculture, finfish aquaculture and the aquarium hobby. The reason people come to us is that they either can't grow enough algae, don't want to grow algae, have seasonality issues, or simply can't grow the right species and strains of algae to fit the dietary needs of their animals. Our non-viable concentrates are being fed to larval oysters, clams, shrimp, as well as rotifers, Artemia and copepods.
Unfortunately, I am unable to describe the process with which we separate the culture media from the algae (proprietary), which is loaded with nitrogenous compounds, phosphates and iron, but I can tell you it is a method being used by a number of large-scale, algae-based bio-fuel producers. Every batch we harvest and process gets sampled and looked at under the microscope to make sure that all the cells are intact and the product meets our biomass standards. We separate the media from the algae because we don't want all the fertilizer components to go into peoples larval rearing tanks and/or their home tanks.
We don't need to add strange chemical preservatives because we rely on refrigeration and freezing to slow or inhibit bacterial growth. Some of our products can be frozen for 2 years making it very valuable to individuals that don't want to buy it that often, which results in money saved on their end. We use RO/DI water and adhere to strict biosecurity protocols. Our customers depend on us to deliver highly concentrated, chemical free products because of the delicate nature of their animals.
This is just a little information on how Reed Mariculture is doing it. Thanks for this discussion everyone! We love talking about phytoplankton.
Chad