Monster, when I do W/C on my 5.5 gallon shrimp tanks, I use airline tubing. One from the tank to a bucket on the floor, and then I put a bucket filled with new good water on a foot stool that places it above the tank and run another line from bucket to tank. Then I try to match the flow between the two. To change about three gallons, it takes about an hour to two. Nice and easy, slow, non stressful way to change the water for the shrimpers.
This works great especially if you're in the same room as the tank, as all you have to do is make sure the water level in the tank doesn't go too low or high.