typically sps are a higher light coral, but it all really depends on the lighting your using, which you failed to enclose in your post... i have an 8 bulb t5 over my standard 75g, and i can grow sps on the very bottom, but my tank has a ton of light and i use high quality bulbs, including 4 ATI aquablue specials that are said to be 12k...
we will need more info about your setup, tank depth, and lighting to give you a proper opinion...