In the process of beginning my greenhouse, still in planning stages. I want a talapia pond and plan to keep it warm by having a rocket mass heater run off underneath it. My thought are to make the stove portion at ground level with the stove pipe run off making a downward turn to go below ground level so that the cobbed area will end up being ground level...and then building the talapia tank over top of this. Does anyone see a problem with this design. Will the downward turn hurt the air draw, etc. I would appreciate any thoughts. Thanks, Steve C.
