ACCURATE MEASUREMENT: Measurements on tube for accurate portion(10 ml, 15 ml, 20 ml, 30 ml), making it easy for you to match the appropriate feeding capacity and prevent overfeeding. Kindly remind: since the connecting part is tiny, please check the envelope carefully when you receive the parcel, the connecting part may be left in the shipping envelope without your noticing QUALITY MATERIAL: Made of quality PVC and rubber material, safe for fish and corals. Long-lasting and durable plastic material, easy to clean, won't broken as glass 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 WITH EXTENSION TUBE: Measures approx 11" (28 cm) in length, comes with a 6.7" extension tube for a total length of 17.7" (45cm), clean deep, hard to reach areas without wetting your arms, work in both small and medium-sized tanks. Please measure the height of your fish tank, make sure this coral feeder is suitable for your fish 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.