Adam, I did a mental dyslexia (420 <> 240). Anyways, 6x39 should be fine on your 65 with softies and LPS.
I recommend getting all of your parameters nice and stable, and optimal, before adding any corals. So, dose now, test, and keep 'em in range. Your alkalinity is on the higher side, it may drop a bit as you increase calcium.
Dan
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