My ducks only have kiddie pools to. It works but gets muddy quickly. We dream of building them a nice pond.
The answer to you question, the more space you can give them inside and out, the happier they'll be. Outside needs more space since they'll likely spend most their time outside.
You'll want something bigger and easy to clean when you need to. Our coop is just big enough for all our ducks to but even wee need to make them their own personal home. Most people's duck houses are floored simply by natural ground. The water is not usually kept inside their sleeping area...
Their not ducks. Same scientific family, but where as domestic ducks derive from the wild mallard, Muscovy's do not. Instead they are south american jungle fowl. Like with breeding horses and donkeys together, you get an infertile mule, when you breed a Muscovy and say, a Peking together, you'll...
He was. Not the prettiest duck but his personality more then made up for it. They are a super friendly people duck. Did you know their not technically ducks? Closely related to the point where they can sometimes breed, but not actual ducks.
I had one Muscovy drake called Elvis. He was a character for sure. Brave enough to take on full sized turkey toms, but not nearly strong enough. When we noticed he was really lethargic. And when he'd mostly recovered and was back in one of the Penn's, someone accidently let him back in with the...