I hadn't until I went by Eco Reef the other day. They have a white rock in one of the tanks and it's floating!!! I had to test it myself and try to push it down a few times...it just bobbed right back up again. Take a look at the video clip I took (by clicking on the picture below)...
![](/proxy.php?image=http%3A%2F%2Fimg.photobucket.com%2Falbums%2Fv729%2FFramerKat%2FECO%2520Reef%2520Aquarium%2Fth_DSCN6125.jpg&hash=09cd72d43a07b77f0060f7156386a81f)
Go check it out for yourself...they're not even charging admission!
![](/proxy.php?image=http%3A%2F%2Fimg.photobucket.com%2Falbums%2Fv729%2FFramerKat%2FECO%2520Reef%2520Aquarium%2Fth_DSCN6125.jpg&hash=09cd72d43a07b77f0060f7156386a81f)
Go check it out for yourself...they're not even charging admission!