I've been seeing this new Zoo Med Floating Turtle Feeder being advertised and bought one at my local Petco for about $9. This feeder is ok. The idea was probably better on paper than in the execution. I have a Fluval 404 and it gets caught easily in the current and just bangs around the other end of the tank. The air bubble inside doesn't really make the feeder as buoyant as the images in the advertising. Here is a video of my RES sort of interested in it.
[video=youtube]http://www.youtube.com/watch?v=qQXNSWKLFv0[/video]
[video=youtube]http://www.youtube.com/watch?v=qQXNSWKLFv0[/video]