Hi Larry! Found this thread searching for aquaponics topics. I'm toying with the idea, though in sure I'm in way over my head. Not looking to produce food fish, just looking for a more enclosed system type setup. I tend to understock so I'm not sure how that would suit a system. I thought it would be fun for my green sunfish setup, they have a pretty large bioload, but I'm concerned about the temp (unheated tank). I may look to pick your brain if I decide to go for it, and if you're willing of course!