I may do that, I should have some fans in the next couple weeks I can get installed. I do have one that can mount over the aquarium maybe I could rig up to blow over the fixtures in the mean time if needed. Or, I can leave the front of the canopy open as well to help get more air. I'm not worried about them just yet, but probably do need some extra ventilation for sure.
You will certainly need the fans in a closed canopy. I have a 5.5" high closed canopy and have 12 X 80mm fans blowing air through the canopy (with three 7206s). Without the fans and using lower powered DIY LEDs, I was hitting 70 C on the heat sinks above the LEDs! I haven't tried the Mistras with no fans. With the canopy fans, I hit 58-60 at high output with average LED levels at about 80%. Note that 4 canopy fans blow over and under each Mistras. Also, make sure you don't mount the Mistras too close to the top of the canopy. Otherwise, the Mistras fans just recirculate the hot air back into the unit.
I'll try running all at 100% this afternoon and see what temps I get.
Hope that helps, Bob