Lighting a 30" deep sps tank

[bigal]

i have 5 ai sols on my tank. i have clams and 90% sps with good growth and color on a 30inch tank. im glad i went with the sols on this tank

[Aquattro]

I think 6 AIs would do the job, and they do have benefits over MH. But, you'll probably miss the look of the Radiums for a while. If you're concerned, you could add 8 units and switch them to all 40 degree optics, which would give you all the punch you needed to get 30" deep.