So this is the plan. It's been modified a bit. I figure I'll put a slight wall up so I can put some pebble gravel in the bottom of the bio filter. I don't plan on cementing the biofilter as I intend to do for the rest of the pond either. We have a layer of clay so when we dig up the pond I'm going to use the clay to line the bio filter. I plan on getting some parrots feather for under the water in the deepest part. I plan on floating plants above that and all rooted plants to be on the sloped side. Some of them need less water than others. I looked through the duckponics thread and if I can find some attractive and cheap plastic pots like she did I may put a few on one end with cattails in them and run the water through them and then into the biofilter. So far I have water hycanith, parrots feather, pennywort, duckweed, and pickerel rush.
I'm thinking I'll do an algae scraper eventually as I saw in another thread but have no plans for it right now.
While I do plan on pumping the water into the biofilter at one end I didn't plan on limiting where it left. The small wall between sections should keep most of the sludge from going into the duck part is what I figure. Any other tips?