Congrats Bruce on such an apparently effective and frugal design. My wheels had stopped turning trying to figure out how I could overwinter tilapia for summer stockings here in Ohio fairly cost effectively and now you've started them up again. Maybe I could make a similar set up in my basement, with a small water heater fed in part by the geothermal furnace?? I'll have the space since the wife shot down the idea of an indoor trout stream down there. Come to think of it, I think I still have a 1000 gal. water trough in the barn. I'd hate to send the heated water down the drain though...oh wait, I have a couple of good size aqarium filters sitting around here someplace...yep the wheels are turning now. Thanks for the inspiration.
