Newbie here on the blog so be gentle. I've played with floating structure for about ten years now on public waters. I have great pictures of brown herons perched for the kill. But I also have a lot of pictures showing the fish hiding in the shade of the island and waiting for their next meal, be it skuds, frogs or the bluegill that was hoping for a dragonfly. In some cases I anchored it short so that it was just beneath the surface. I've built several using different materials. The best I have found so far was to use a closed cell foam floor pad or Beemats (holes already drilled) for flotation and then sandwich it between PolyFlow Black matrix. I can help with details or send you the materials. If you have aerators and can position it above the aerator, it works even better and is an in-pond bio=filter.
Roswell Conservation facebook post

Last edited by DesertBass; 12/02/17 08:09 PM. Reason: Trying to add image.