I've been in contact with BDB, and he sent me a video of what looks like a bunch of fish hitting the surface in his pond, and this was BEFORE he put any fatheads in. He says what's shown in the video is happening all over the pond.

I've asked him to post the video here if he can.

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."