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Yeah I thought about that too, but my ceiling joists are off center. Making it a little tricky. I prob could get another 6" out of it, but not sure if it would be enough.
I agree with everything reeferdre said above. But, what do your ceiling joists have to do with anything? Aren't you using a canopy?
You could definitely use some C-channels but your issue is more the hanging kit. If you used the C then I think you would want to mount it directly to the ceiling and avoid using the wires. You could retro a few t5 on either side of the lights if you hang it directly to the ceiling and have an easy DIY hybrid. Your setup is sweet just be patient.
I just read through your thread. Did you start having issues right after your anemone got shredded? Great build by the way.

Agree on the age of your tank. Too soon to expect much right now.
Seeing your pictures, you can get a lot more height by finding another way to mount those lights in your canopy. I have AI Hydra 52s mounted with S-hooks to a set of aluminum tubes. Room enough for the cooling fans on top of the lights and about 8" off the water.
My mounting rails:
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Also, it is not recommended to put ATI fixtures inside of a canopy, if you are considering that option. Really expensive fixture to fry in a poorly ventilated canopy. Needs to be hung from the ceiling or from mounting arms. I did read a few days ago that ATI is looking into making bracket thatwould allow the fixtures to be mounted to the tank itself.
Good luck in resolving your issues.
They are way to close to water, they should be about 10 to 15" inches above water. I have 2 T247 over my frag grow tank and 2 S026 over my frag sell tank and they work great. I had a TEK 6 bulb T5 unit with all ATI bulbs and did not have the color or extention that I have with the LED units.

