vacum cleaners

vacum cleaners
How do I work one of the ”tube vacum” tank cleaners?

I used to have fish and never figured out how to use the gravel cleaning thing where you put the box thingy in the tanks and the water flows out the tube. I just got my tank all set up and am not wanting to have to do i full on cleaning thing everytime, any advice?
it looks something like this
http://sunnyfishtank.com/sites/QKAMUANGA/_files/image/Hagen%20Fluval%20Edge%20Gravel%20Cleaner%2013%20inch.jpg

fill the hose section with water from tank or faucet, place wide end in to fish tank,place small end in bucket on the floor, gravity will do the rest, or you could suck start it, but you risk getting a mouthful of tank water…

iRobot Roomba 560 official video demo

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