Hmm... water sounds good, I would probably bring down the specific gravity a little bit if I were you, but this would not be causing algae like that. A lot of algae problems seem to come from too much light or a trAte problem, and both your lights and trAtes look great. Is it in direct sunlight during the day? You said you recently adjusted the light, was it on for longer before? If you cut it down drastically it could take some time for algae to go away. Also, you said you just added brand new carbon, was this about the same time you noticed the algae, could have something to do with it. I personally do not routinely run carbon in my tank, unless something goes wrong where I might put it in for a couple weeks. Some more snails along with some crabs and hermits could also help.
What about temp, it would have to be pretty high though, and from the looks of everything else, I imagine your temp will be good also.