Looks good so far
Ive thought about this. This setup will have two ballast so even more heat. I may very well take your suggestion. My house gets hot during the summer and this tank will have rcs in it so I need to make the cooling as efficient as possible. If mounting the ballast outside equals a degree or two it is worth it.Maybe some red plastic shapes for the tank? I learned to figure it is their tank. As long as it doesn't keep the fish awake, I'm up for whatever they like.
Question about the little nano? Is there any problem with heat or some way for it to escape at the top? On the DOOD's, I was wondering how having the ballast outside the canopy might work? I stripped one out of a light and hung it on the back to get better airflow. May be no problem anyway but it might help in the future? Seems like the ballast was the hottest part.
I dont think I will need to but I might. There is a hole in the very top, in the back center. I can feel air coming out of it with no fans running.Looks good.
Somehow get some surface agitation to increase evaporation which will increase the cooling effect. Maybe put an air wand on the side of the incoming air.
I think with four fans blowing and the vent I cut in the top it should cool pretty well.Hood is looking good. With 4 fans you should have no problem keeping the air above the water fresh.