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Just coralline algae, red, violet and an ugly greenish one. My tank sits in the sun and gets lots of sunlight from 8:00 till 17:00 besides a T5+leds ATI fixture.
I have more than 20 tangs and about 300 snails (mainly turbos, tectus and trochus) grazing on every little algae that could show up. NO3 and PO4 are always undetectable despite I sometimes switch off the skimmer and have no other filtration system that the one provided by about 400 SPSs. I feed quite heavy frozen food, pellets and flakes not less than 4/5 times a day.
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