When I put out pallets for my FHM for spawning substrate, they eventually would sink. So my solution was to put some strips of the foam insulation in where the fork lift forks would have gone and screwed the insulation into place. Then the pallets would remain floating. Kind of a combination of what Kevin and John did. A combination of wood and floating insulation.
The baby newly hatched red ear sliders that claimed my forage pond as a home loved sunning on these structures. As well as numerous frogs. Did not think about putting any in my main pond (there is plenty of other FHM spawning areas) but might have to incorporate Kevin and John's ideas and make a specific turtle float for my main pond. Put a little ramp around making it easier for the turtles to crawl aboard.
