Dont forget the UV sterilizer...outside that tank will BLOOM!!!! Yes, even in the shade. You could wrap three sides of the tank in winter with insulation to aide in temp. preservation, but you would need good circulation to keep those fish alive in both winter and summer. Heat takes the O2 right out of the water in summer and a static heater relies on proper water movement. I think it would be awesome...just plan it out to avoid dead fish and dont abandon your tank maintenance duties...you know what they say..."out of sight, out of mind"...?