Hi All.   would croppie or blue gill or perch work?  how long to harvest size? asking about these types because they do pretty good in the cold ice covered lakes of Wisconsin.  How deep does the water have to be? wondering if anyone has tried aquaponics using an old "hot tub".  People give away fiberglass hot tubs that no longer work. They would probably be 2.5 to 3ft deep. Could a trough tank heater, the type that sits on the bottom be used if it had a protective screen over it.  Thanks

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