ZeoVit Coral Vitalizer - Coral Food The new Coralfood Concentrate contains both liquid and solid elements, providing food to SPS corals as well as several soft corals. Does not increase PO4 or NO3. First results can be seen after 7 - 10 days. When the corals are used to the feeding you will notice increased polyp expansion, e.g. of Acropora are fully extended even during the light period. Corals retain their bright, natural color. Increases coral growth. We recommend a dosing of 1-3 drops per 100L/25 gallons /day, depending on the live stock in the tank.