Looks like a neat little reactor. Would it work with a diy system in a 55 gallon?
http://www.drsfostersmith.com/product/prod_display.cfm?c=3578+3747+15524&pcatid=15524
http://www.drsfostersmith.com/product/prod_display.cfm?c=3578+3747+15524&pcatid=15524