I have an empty standard 55 gallon tank that I am thinking of turning into a turtle tank. I want to fill the tank half full of water,and cut some acrylic and glue/silicone it to the glass for a platform on one side of the tank.I also want to have gravel and a couple pieces of driftwood in the bottom.I was thinking of filtering the 25 or so gallons of water with a cannister filter. Would a cannister work on a tank that is only half full?