QUALITY MATERIAL: 50 ML Coral Feeder is made of quality plastic and rubber material, safe for fish and corals. Long-lasting and durable plastic material, easy to clean, won't broken as glass. Size: The total length of 50 ML Coral Feeder: 18.70' (47.5cm, including the rubber material which is 3.34 inch). Please measure the height of your fish tank, make sure this coral feeder is suitable for your fish tank. CORAL SPOT FEEDER: Used in marine reef tanks for gently target feeding coral and other aquatic animals with ease and comfort. It can also be used for liquid fertilizer add in the freshwater plant tank. MULTI-FUNCTION: These feed tubes help to clean debris from those hard to reach areas of the aquarium or blow away algae that may have accumulated on rocks. ACCURATE MEASUREMENT: Measurements on tube for accurate portion, making it easy for you to match the appropriate feeding capacity and prevent overfeeding.