Taiyo Pluss Discovery freeze dried tubifex worms are a nutritious all-natural high protein fish food with an appealing flavor that is ideal for feeding small to medium-sized freshwater fish, discus, and amphibians. This food is in the form of a cube, allowing it to be pressed against and stuck to the inside glass of your aquarium, making feeding time fun to watch. They are easy for fish to digest, benefitting water quality, and allowing you to enjoy your aquarium.