showjumper_girl2002, I note that you are in Florida, as I am. Are you on sandy soil?
I am on sandy soil and both my son and I have hardware cloth under our coops, lying directly on the sandy soil. We use deep layer bedding on top of the hardware cloth. The hardware cloth [which is attached to the coop walls] prevents predators burrowing under the coop. Predators have twice tried to dig under my son's coop in the last year [fortunately, none have so far tried to burrow under mine.]
For deep layer bedding, we both started with a layer of oak leaves as they are in ready supply in my neighborhood. Then we added a layer of pine shavings. That ensures the ducks feet don't get injured by the hardware cloth. When the bedding gets wet or soiled, we add more pine shavings on top. Every now and then we add another layer of oak leaves which make a good barrier to stop wet from the shavings rising. In the winter we used pine straw for the ducks [I have two muscovy and two pekins; my son has two pekins and one muscovy] to snuggle in to keep warm. Some people use straw, but pine needles compost well. The deep layer bedding is warm in the winter months and gets dug out around now. It makes good mulch for the garden or can be composted a little longer [the lower layers will already have started to compost -- the process that keeps the ducks warm in the winter.]
I don't like the small duck houses: I think the coop needs to provide a minimum of 4sq ft per duck although ours offer them 8sq ft each.