Your tank looks great! Your dKh is pretty low and may be limiting your lps/sps growth. I would try to keep it up around 9 or 10. If you have to add a lot more dKh to get it to start to raise then that should tell you your corals are limited by lack of carbonates. I would also try to get your Ca down between 400 and 440. You may also want to keep an eye on your phosphates but nothing there gives any indication they are of concern. IMO, there is a good chance it is your dKh. For comparison, I am adding about 200ml/day in a 90G!
Dan
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