I know there are alot of pods/planktons that will take up residence in that algae, and depending on how much buildup you have there could be quite the load in there. I would think however that if the SPS are going to benefit at all, it wouldnt really matter the time of day, they should be able to notice the increased food content in the water and extend their polyps. Doing so at night however would make more sense as that is the typical time at which SPS will feed in the wild. Maybe let the algae go for a couple of days and scrub it off sometime when its irregular for your SPS's polyps to open, and if they respond positively, that will be a more indicative answer to your question?
Chris
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No more tanks  - Laying off the ReefCrack for awhile!
Cheers,
Chris
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