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I believe you'd need more light on a deep tank like a 90. Carey on this forum has it over a 40 and seems to grow softies and lps well but no results for sps/clams/nems. I'd get two 120 watt dimmable eBay leds if you want to keep anything you want.
It's not enough for your tank. What do you want to spend and what do you intend to keep? If it's just soft corals, the fixture above will be fine, but if you want to be able to keep clams, anemones, and acropora, you are going to want something much stronger.
2 of these would work well- New 2014 120W Dimmable LED Aquarium Light Marine Coral Reef SPS LPS White | eBay
One reef breeders value fixture dimmable. Run it at 70 percent blues 40. Whites grows well. Placement is important. Personal two is overkill because of the shape of the tank
Oh...corner tank. Gotcha. I'm thinking 48". The reef breeders and the one I posted a link to are basically the same. I bet they are the same manufacturer. The extra colors are just personal preference.