Fan positioning on hanging canopy

[childress5tyler]

I built this canopy over the weekend to go over my 80 deep blue rimless tank. I'm running 2x PFO 250 HQI halide fixtures but obviously hear will be an issue. I'm torn between running two fans on the top or 1 on each side. Any advice would be much appreciated. Thanks!

 

[revhtree Verified Admin]

Why not pull from the back?

 

[childress5tyler]

My back will be opened