Feature: Remove the dirt and residual feed at the mini fish tank bottom. As a mini-tank water changer device Suitable for brine shrimps, red worms and daphnias feeding after food unfreezing The amount of water absorbed by dropper can be adjusted by controlling the strength of grasping the dropper end. Add a liquid additive to the tank as a measuring tool. Description: 6 Colors: Blue,Yellow,White,Pink,Red,Black(random sent) Material: Plastic Application:Water pumping and changing for small fish tank, fish disease treatment for large fish tank. Length: app.43cm(50ML) Package includes: 1 x Aquarium Cleaner Pump Note: 1. Please clean the product before use. 2. The dropper end and the pipe part are tightly connected. Please use after confirming. 3.Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. 4.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you