just use a standard gravel vac and get a tube that is long enough to drain outside.. gravity will do all the work for you..
my tube actually is like 50' of clear tubing attached to a garden hose.. that way it gets all the way out the door for all my tanks, and i can fill it back up using the same tube..
on the tank end, i have a valve that allows me to stop the filling/draining of the tank whenever i want.. for filling ill use a different pvc piece on the end.. for vacs i use a longer piece of pvc that reaches the bottom of the tank..
i can take a pic of my rig this weekend if anyone wants.. or i can draw up a pic on paint.. cuz my explanation is kinda confusing..
my tube actually is like 50' of clear tubing attached to a garden hose.. that way it gets all the way out the door for all my tanks, and i can fill it back up using the same tube..
on the tank end, i have a valve that allows me to stop the filling/draining of the tank whenever i want.. for filling ill use a different pvc piece on the end.. for vacs i use a longer piece of pvc that reaches the bottom of the tank..
i can take a pic of my rig this weekend if anyone wants.. or i can draw up a pic on paint.. cuz my explanation is kinda confusing..