I have been toying around with the idea of using one of these http://www.bulkreefsupply.com/store...tors/deluxe-brs-gfo-and-carbon-reactor-1.html in my 210g African tank. My thought is to run Purigen (or similar media) in it to help reduce nitrates and/or carbon for water clarity. I'm not thinking about this to get away from water changes, but to provide better quality water for my fish. Any thoughts?