6 Bulb 36" TEK Fixture Enough for a 75 Gallon SPS Tank?

I'm thinking it's a 4 ft tank? It will work. But you'll have to keep the coral grouped under the fixture. You could always supplement with an led later on on both ends for a larger spread
 
Yes. It's a good fixture and if you stick with good bulbs, it'll be enough. Obviously depth will matter and if it is a 4' tank, the edges won't get a whole lot but that's what LPS and softies are for!
 
I’m using 36” fixtures on my 80g & 60g tanks, both tanks have a 2’ x 4’ footprint and both are AIO’s. Because the are AIO’s the display is only about 42” but like Justin stayed the far sides will be great for lower light corals.

Feel free to come by and see how the light spread works from a 36” fixture, how I have mine set up may give you some ideas.
 
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