Give your marine fish， invertebrates and desirable algae a boost of nutrients with Kent Marine Zoe Vitamins， Minerals & Amino Acid Supplement. Supplements can enhance growth and coloration of marine life， but if they are not preserved properly， they can give off an unpleasant odor. Kent Marine Zoe Vitamins， Minerals & Amino Acid Supplement is properly preserved， containing less than 1/2 percent of odor-causing preservatives， and has a 4-year shelf life without refrigeration. It contains aquaculture-grade vitamins that remain active after one year in your aquarium and natural minerals from spirulina and kelp sources.