Anyone done this? And I don't mean having the equivalent of a freshwater refugium. I'm currently getting ready to set up my 155g, which was used for saltwater and is drilled, so I will be doing sump filtration since I'm going to have some fairly big fish in there. Since I'm already going to be doing this I am strongly considering having the water run through an aquaponics bed before entering the sump. Any potential problems? This appeals to me both because I'd like to grow veggies in the winter and because it would hep suck nitrates, and keep the water quality up in my tank. Anyone doing anything like this or have any feed back? How effective will it be in helping the water stay nice?