This is the first spring that my pond has been; I feel well established; 2nd year overall with my pond. I had planned on scooping most of the leaves off the bottom of the pond this spring anyway but I have noticed that they are all slowly rising to the top. Is this normal? I don't mind them floating to the top, it makes my life easier cleaning them up and the fish don't seem to mind or be affected in any way. I don't remember last spring any leaves floating to the surface, nothing like this year.