Tetra Tropical Color Flakes contain the Tetra Active Life Formula, with antioxidants for healthy cells, select proteins for growth and prebiotics for digestion. Active Life Formula helps nutritionally support fish's immune system for optimal health and long life. Good nutrition happens daily. Feed two to three times per day, only as much as your fish can consume within three minutes. Uneaten food can cause water-quality problems. This food will not cloud water when used as directed.