Not sure if you can ever totally eliminate algae and have enough light for SPS. It is certainly worse with higher phosphates. But even when my P04 is down to zero (Hanna checker), as it is now, algae will still hang onto wherever it can find some nutrients. Eg, where detritus can accumulate in rock crevices, on dead coral tissues (I had some RTN on some SPS this past summer), etc. The best solution for that is the toothbrush and turkey baster.
I understand that chemical solutions do work as well such peroxide, H2O2, but have stayed away from that. I have tangs, and figure a little algae is good for them to browse on. And the glass can be kept clean with a scraper once or twice a week.
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