Summer is coming and I don't want a chiller. My first attempt at fan cooling on this tank was over the sock section in the sump, it didn't cool enough so I set off to build an Air Gyre. It doesn't gyre bit it does blow a lot of air acros the water surface
First I marked up my 1/2" plexiglass
After the rough cut, I drilled and tapped mounting holes for the fans
After spending some time with sand paper, files and a belt sander getting the straight parts straight and the round parts round I start finishing the edges with a router
Best helper in the worls woke up at the crack of noon to help out.
Next we used nylon machine screws to mount the Noctua NF-A14 iPPC-2000 5" industrial fans, IP52 certified water and dust protection to the Plexiglas
And here it is on the tank
Before building this setup, I used these fans with the bracket at the top of this post for proof-of-concept and it was remarkably effective. no need for a chiller and if left on, even with the halides I can cool the tank enough to turn the heaters on.
[youtube]