No experience with the Nova Extreme, but I've been using a 36" Hagen Glo fixture for over two years now and it's been trouble free. Initially as main lighting but now with two actinics for dawn dusk lighting effect.
Mounting is quite flexible, a good quality hanging kit is provided and there are extendable arms on each end to mount directly on to tank. I kept the fixture close to the water surface initially and found the reflector easy to clean. The salt splashes wipe off with plain water whereas my retrofit single reflectors are much more difficult to clean up. Waterproof/resistant endcaps are well made.
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