I recently noticed these flatworms in my tank. Their population has grown quite rapidly. I used Salifert Flatworm eXit a few days ago, and I did witness some of them floating away into the water column, so they were, at the least, stunned by the treatment. Today, they are all over the glass and PVC fittings, but they are not on any of my corals. Are they a photosynthetic type of flatworm?