I can understand why you don't want standing water.
But I had heard that dragon flies like still water (and so do lilies), and at one time I was actually trying to come up with a way to get a spot in the pond or bog like, to attract them to lay eggs. But since, I've seen them laying eggs in the pond. Hopefully the hornwart that covers the top will keep the fish from finding them. And hopefully they can spend their 1-2 years on the bottom (but I've no muck down there for them to hide in) and can grow up.
I like that orange-and-black koi. I managed to find one for my pond, but he was too imature and fragile, and didn't last two weeks.
Nice video.