OK here is photo
To explain, The t5 fixture is sitting on the storm window pane which is sitting directly on the top of the acrylic of the tank. The fans I use are these:
Coralife 3-1/8" Cooling Fan Kit I simply made a couple hooks from scrap sheet aluminum which I had laying around and used the bolt holes (the fan comes with Stainless bolts for mounting) and hooked it to a lip in the end of the light fixture. The tape holds the fan wire to the case in such a way it points up into the light. Quite effective. By the way you can see the second fand (identical to the other) bolted to the case running thru-wall. I use it every once in a while when I think things are way too wet. I sometimes run it overnight. It never lowers the humidity below 70%, but I run this tank at 90-99% most of the time and that's pretty wet!
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Ross
http://orchids-ross.blogspot.com/
I don't do most Dendros or large, "floofy orchids". For me it's minis (like Angraecoides), Masdies, Paphs, and others that crept in somewhere along the line. See my orchid list for complete collection (usually not current.)