In my hood I am going to seperate the bulb from the surface of the water with acrylic, and will be running a 4" fan that will move way more air than computer fans. So essentially it will be like hanging the unit. I would hang it if I could, but there would be too much light leakage for my co-workers. My office building is air conditioned, so summer wont be as much of an issue as in a house.
I would run 250w but the ballast I have spare is 400w. My 250 ballast are dual PFO in 1 box, so cannot easily pull 1 out.
I can add a 3" fan if that is not enough, plus misc. fans over the sump if required.
The 1 thing that might halt this plan though, is the noise of the fans. If it is too disturbing then I will have to go with VHO lighting, but I want to try out SPS corals, and I dont think VHO would be good enough for that, although I have never tried.
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