Atlas Tropical Fish Food in Pellet Form Atlas Tropical Fish Food is a balanced diet for all types of tropical fish. It contains natural astaxanthin and an essential element that enhances fish growth. Krill meal is added to help fish improve digestion and nutrition. Ingredients Fish meal, wheat meal, soybean meal, fish oil, multivitamins, and trace elements. Feeding Guide Feed the fish two to four times daily, as much as the fish can consume in about 5 minutes.