They are very misleading just like biowheels for SW, so misleading. They are nitrate factories, you can try it if you like, but when you start having things die and can't figure out how to keep nitrates down, we told ya so.
Here's a good thing to read through:
http://www.fishforums.com/forum/showthread.php?t=7
If you would like more info on the Aquaclear filter refugium for your tank, LMK