BOYU HC-01 RED WORM CUP -7 cm x 6.7 cmThis worm feeder is designed to feed red worms, red earthworms and others for fish in aquarium or fish tank. It can make the living food leak slowly to solve the problem that the food may sink to the bottom before being eaten. Features: Plastic material is durable fro long term use. Can be free-floating or attached to the wall of the aquarium with the suction cup. Perfect for feeding red worms, red earthworms and so on. Can avoid waste from feeding too much or ecological change of aquarium. Preventing the living food from scattering in aquarium or sinking to the bottom before being eaten.