I have had a couple of times where I have seen on the bottom of my pool typically in the deep end what I thought was clumps of small green leaves. This has usually occurred after a windy day. I would put the robot in and let it clean but usually to my surprise when I went to empty the filters there was no green stuff. I had some today from a day ago and decided to use the net to pull the stuff out of the pool to see what it was and when trying to pick it up it just dissolved into the water. Do I have an algae problem? FC is at 7ppm.