New Life Spectrum Thera Sinking Pellets is a color enhancing, hormone free formula. With high quality ingredients designed to boost the immune system function while enhancing the fish's color. This food provides essential ingredients to recreate the diets found within the fishes natural environment. Available in many sizes to accommodate any sizes fish, with formulas recommended for particular species. Non-medicated anti-parasite formula. Easily digested and slow sinking, these pellets will not disintegrate and pollute water as other foods can. Excellent when introducing new fish. These pellets can be fed to both freshwater and marine fish.