I've come up with a simple canopy that should work fine. I'll show you what my current canopy looks like and how it's built. This is the same design I started with almost 20 yrs ago when I first set up my 50 reef.
Basically I just built a box with 1x8's with 4 sides and no top or bottom. This is where my 4 reg flourescent bulbs sit. Then I built another box with 4 sides and a top. This houses the MH
. The second box just sits on top of the first.
While this worked perfect and gave me all the access I needed, it worked better on the 3' 50 gal
tank than it does on the 75. Reason being the 50 only had 1 MH
bulb and the 75 has 2. The top box just holds the heat too much. During hot summer days I have to keep the A/C going and put another fan in the canopy.
So on to the new simple design. Not much to describe, so here's a few pics.
I will have 2 holes cut on each side for fans, but pretty much that's it. It sort of looks like it needs something, but it is solid. Oh, and you are looking at it upsidedown (obviously) and the piece leaning against the new stand is the door that will hinge up to open.