One other plant question today.... The top of my tank is being totally overrun with a little floating plant that looks like a two-leaf clover. I scooped out about 12 cups of them last time I made a water change. They had taken over half of the top of my tank! Next time I am going to scoop out a lot more. They look like a little two-leaf clover that has a little stem that shoots down about an inch from the top of the water. They just swirl around up there and multiply like crazy. They are easy enough to control because they float on top, but does anyone know what these are? I know identification is hard without a picture. I will try and get one for everyone later today.