I just recalculated your volume. Since you have 54" walls, your water level is probably about 50" or 4'2" (4.17 feet.) So, your volume is more like 26,700 gallons. It would be helpful if you could edit your signature and put that volume in so that when people are helping you, they have an accurate volume to work with. You can edit your signature by clicking on the tab in my signature. Thanks!