Did you just "drop" your bulbs in, or did you anchor them? I'd been looking at them at Walmart for awhile, and after reading this post, I decided to buy some. The first one, I just aimed and dropped in- and it landed just about where I wanted it. The second one is still just floating around the surface of my tank! :/ Did this happen for any of you? If so, how did you anchor it down? I think I have some lead straps from my plant bunches at Petsmart, but I don't like the idea of lead in my tank....