I have had a small explosion of these things in my tank in there last couple days. And some other sponge looking material growing as well(they have a couple openings like sponges so I am guessing thats what they are). The "q-tips" are to small for me to get a good picture of with my crappy camera and the other is barley visible on some of my back rock so i cant get pictures of them. Should I worry or just leave them be?