Don't they already make plastic feeding rings out of 3/4" plastic piping, that floats and keeps floating plants and other floating debris out of those gravity-fed filters that suck water from the middle? One of my local fish stores keeps their plants in big tanks that are filtered with a gravity-fed filter, and has plastic rings to keep floaters back from the intake (the intake pops up in the exact middle of the tank...).
I would assume that the flexible tubing from an old Fluval joined with a staple or possibly glued together would work just fine. Or you can just go to the water toys section of Wal-Mart and look for floating toss-rings for the pool. Only problem is that it'll come in hot neon orange, pink or green, and thus not look that fantastic.
There may be a plastic-bonding paint you could use to make it a more pleasing color, though.......
Last edited by Mangala; 08-07-2008 at 11:35 PM.
Reason: spelling error.