Use this clear hose to siphon water from your tank into a sink or bucket for disposal. Water changes are a regular part of tank maintenance. You can also use the hose to vacuum uneaten food and other debris off the bottom of the tank. Be very careful not to go near the jellyfish as you are siphoning water because they can get sucked in. Hose is approximately four feet long. Follow these instructions to start a siphon.