Marnie, I dont see why you cant keep most anything under that lighting. Perhaps there may be a few acro,s that require more light but most corals will do just fine.
I only run a pair of 175w 10K Ushio bulbs on my 5ft. 170 and everything is fine. I have lots of sps but no acros.
If you keep the more light loving clams like crocea or maxima, I would keep them up a bit higher on the rock structure somewhere. They like it there anyways. The other larger clams like squamosa and derasa can take less light, {although they still require decent light}, and can be placed lower on the bottom.
You may have a bit slower growth from some corals, but thats fine.
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Doug
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