Have Your Deck—and a Pond, Too Tom Hardy wanted a pond and a bigger deck, but he couldn't decide which he wanted more for his house in Canton, Georgia. So he enlarged the deck and put two ponds in it. He used rigid plastic tubs for the ponds, setting them into "sandboxes" under the deck. The deck boards were cut to follow the edges of the tubs. All together, the two tubs hold about 500 gallons of water and contain 18 large goldfish. A waterfall connects the higher tub to the lower one.