Bruce I don't pretend to know anything about raising perch and I really think the setup is cool, but I have a concern about freezing in the lines. Maybe it is the Michigander in me but I would be concerned that the line would possibly freeze between the bottom tee and the lower drain valve. This is the valve you use for cleaning correct? Since it is usually in the off position wouldn't you have water always sitting in this area in 10 degree weather? If this area frooze and the pipe broke wouldn't the tank completely drain?
