Phyto GroFormula is designed to mimic the natural autotrophic plankton community and a key part of the reef. Phyto GroFormula is a high protein micro-biotic powdered coral food. It can be used in addition to other foods. Water column feeding was best recommended feeding method when tested by our Marine Biologists. Phyto GroFormula is designed to deliver high protein, amino acid rich nutrition to your mixed reef systems and filter feeders.