Unless you are aerating from the bottom of a 20' depth area, the water down there should generally be not used by any fish. I may be wrong, but I think without aeration at those depths, the water down there does not have adequate dissolved oxygen.

Floating islands are a good potential idea for you. Years ago, there was a company promoting and selling floating islands that would grow plants on the top, and below the float would have the root systems which would attract small bait fish.


As others said, if you could build in some dirt humps that could get within 5-10' of the surface, that would be very productive.


Excerpt from Robert Crais' "The Monkey's Raincoat:"
"She took another microscopic bite of her sandwich, then pushed it away. Maybe she absorbed nutrients from her surroundings."