Pool filter for Duck pond

[Sushiducks]

I have a ~2000 gal pond with 6 ducks, lots of frogs and a few hundred minnows lol. I've had a lot of success using a biofilter of river stones and mechanical filter that includes a filter cartridge and UV light clarifier. I also use beneficial bacteria with barley extract. I never drain the pond. I do get some algae growth on the rocks but the ducks and fish eat it so I let it stay...

View attachment 1923520
View attachment 1923524 (

How do the minnows and frogs do? We are excavating now but won't be up and running until spring. Was wondering what could share the space with our 4 Muscovy. Our pond will be about 12ft by 20ft, by 3ft deep.

 

[Kiwibird]

Lots of us use kiddie pools or half barrels for our ducks. Does anyone have tips for keeping those cleaner? Even halving my water use would be more eco-friendly.