Feed your corals， sponges and other fine filter feeders a nutritionally-balanced diet with Kent Marine MicroVert Invertebrate Fine Filter Feeders Food. Invertebrate food that has not been properly preserved can smell rotten or astringent if preserved with non-food-grade chemicals. Kent Marine MicroVert Invertebrate Fine Filter Feeders Food contains high-quality preservatives that have a long shelf life without refrigeration so it won't smell. It is also rich in vitamins and natural minerals from spirulina and kelp for enhanced growth， health and coloration.