I will take a picture of it this morning when I go to the pond. The reason I didn't think it was FHM is the metal was laying flat on the bottom and I couldn't see how they could get under it to lay their eggs. If the eggs are identified as FHM's then one could just lay sheets of aluminum on the bottom without any kind of suspension for FHM spawning.

Also I saw a new plant growing in the pond yesterday and was very happy to have it since I have tried to find it when kayaking in other waters. It is American Elodea.