Anyone ever use one of those continuous gravel vacuums? They're like a siphon that's powered by a pump that sucks up the water and puts it right back into the tank so you can do extended vacuums without removing water.
Yes, it does. I just bought a 10 gallon hex tank for $20 because it also came with one of these for free. I have another 350 in use already as a secondary filter. So I get to use this one now for thorough gravel and sand cleaning on all my other tanks... and extra water polishing whenever I need that.
i use a HOT Magnum filter to do that the model with the bio wheel attachment comes with a vac so you can clean your gravel and the water filters thru the hot magnum and goes back into the tank very handy and easy way to vac.