If you go to Pet-o-rama you'll see they have them in their tanks. I think they are nice in the freshwater tanks. But IMO I don't think they do well in reef tanks. I've never seen a tank that has one be anything but pretty nasty looking after a while. Hair algae, bubble algae and all that other nasty stuff grows on it. If you want to get something get th mag-rocks that you can put rocks on your back wall and then add some zoas or something so that it grows along the back. I think that will look better in the long run.
