Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
I occasionally use a pump when a tank does not need a gravel vac. I use a pond pump. These have an outlet that can accept vinyl tubing. Garden hose works fine, too, if your pump can hook up to one. Pump inside the tank, not touching the bottom (yes, they get blocked with debris) end of hose where I want the water. Turn on pump. If the sink it downhill you can turn off the pump once the flow is going well and the water will continue to siphon out. If the sink is only a little lower it might go too slow. Clamp the hose in place so it does not jump out of the sink.
If the sink is low enough you could add tubing onto your gravel vac and drain it right into the sink.
You could still do a gravel vac into a bucket on the floor below the tank, then use the pump and hose to get that water to the sink. This is the way I do it most of the time. (actually water goes out to the garden for the plants.) I have a neat little extension cord that I found at Wal Mart. It has a large button to turn things on and off. Set up the pump with this on/off cord, then I do not have to plug in the pump when my hands are wet from the tank. Just step on the large button.