So what is it? It's a high-quality syringe featuring a thumb and finger(s) grip for contoured control, even with wet, slippery hands. The syringe is connected to an elongated plastic tube via a black rubber hose, allowing you to reach deep into the aquarium with ease. What can you use it for? A TON of things. A few uses include coral feeding (especially useful for NPS tanks), pest control via liquid eradication, or even removing fine algae-buildup on the sandbed.