They are a complete pet food for fish. Vitalis Catfish Pellets XS 1mm Pellet Extra-Small Food Bottom Feeder Tropical. VITALIS TROPICAL FLAKE FISH FOOD FRESHWATER LARGE FLAKES HEALTH COLOUR AQUARIUM. VITALIS MINI MARINE GRAZER SUCTION FIXING FISH FOOD 120g 240g 1.7kg AQUARIUM.