Fluval Colour Enhancing Medium Sinking Pellets are a high quality, super palatable fish food specially made with an effective colour-enhancing formula that brings out the best in tropical fish. It is specially formulated to keep tropical fish active and looking vibrant. This food is a great source of protein, with trace elelments and antioxidants from several key ocean fish including Atlantic Herring and Norwegian Krill. Also containing kelp, it is a rich source of omega 3, polyunsaturated fatty acids, proteins and carbohydrates. All kelp is harvested in an ecologically responsible way to help preserve ocean stocks. It contains no artificial colours.