NutraFin Max Tropical Fish Flakes contain multivitamins and minerals suitable for freshwater tropical fish. NutraFin Max includes omega 3 as well as yeast extract, a probiotic to help digestion. Its main protein source is Alaskan Pollock and the food also includes earthworm meal, garlic, and salmon oil, making it both healthy and irresistible to fish. Aquarium owners who are concerned about chemicals that artificially color fish flakes should know that this NutraFin flake food flakes only uses natural colorants.