I will tend to agree that you could keep SPS under a fair wattage of PC, as long as the colonies aren't too far from the bulb. I will say that there are some that will do better than others... the 'lower' light SPS, like some Montipora and Seriatopora (Birdsnest) will probably be your best bet. Try a frag first... 30W of PC (2 x 15W?) doesn't sound like enough. And don't expect great growth or color.
This is one of those things where more is better... I keep my zoas and macros under 70W metal halide in my 10 gallon.
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Calvin
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Planning a 29 gallon mixed reef...
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