it is something I'm considering quite a lot, but I want to get our led project going a bit before getting on something else. How will you handle the temperature in the tank? Summer temperature here is a killer (this why I'm focusing on LEDs, to make a proper grow the next summer)i have been doing a bit of research and it looks really promising it might be right up your alley actually
http://www.backyardaquaponics.com/