Ive been exchanging rmh info for fish info with a tillapia farmer that is interested in using an rmh to keep his tank room at 70 degrees. Anything much less than this and the fish die.. I want to make sure I give him good advice.. The space were talking about is a 24x28 double layered hoop and plastic greenhouse soon to be expanded to 88' long. Being in mid florida, the temps are pretty mild but still gets to freezing fairly regularly. Taking into acct the water heat retention, the thermal loss of the plastic and an 8" rmh, does anyone else feel it possible to keep a constant MINIMUM 70 degrees? Seems to me that the early hours of the morning would need a supplemental heat source. A few recent posts of using wvo as a constant feed come to mind as a way to keep the fire going unattended but this is his family income, not too keen on an untested system. Possibly screw fed wood chips or wood stove pellets? Any thoughts anyone? maybe other heaters?