I need to come up with some way of cooling my recently converted hood. For vision related reasons, I am forced to leave my 2x250W MH
's about 4" off the water. This is ok except that I will soon be running into a heat problem as I run the lights more every day to acclimate.
Below are a few pics of my current setup. I am debating whether one or two 37cfm computer case fan venting up in the center of the hood would be sufficient in keeping most of the heat from building inside the hood and pushing down on the water. Alternatively, my wife suggested mounting a couple of 120mm fans just off the wall behind the tank, concentrated one per MH
bulb between the hood and the water.
As you can see, there is no shield between the bulbs and the water. I had to remove it when I did the retro fit. I don't seem to have a problem with salt creep or splashing, so I'm not so concerned with this. However, it does limit airflow inside the hood from the two small fans that came with the hood.
What would be the best way to reduce heat on the water for this setup? Any advice would be greatly appreciated.