I wouldnt bother with the plants, give them a month or so and they will be digging holes round that pool and its gonna end up a sloppy mess. When they are a bit older, I would use them stones to lay down and put the pool on top of it to stop them digging
i only have one duck right now thats using the pool and he lives inside so the pool will only be used when im outside. No worries about the ducks tearing anything up
Gotta have at least 2 ducks.... They need company. They will make a hell of a mess of a small pool. You may have to dump and refill it a couple times a week.
i have two other ducks. they are smaller tho so i am waiting to put them together full time. they can see each other but are in separate housings. I planned on cleaning it a few times a week anyways. Its better then my bath tub gettin all poopy