Nothing is standing out as a specific problem but there are a few "general" correction you should try.
Most of your issue seems to be with the LPS
corals. They do not need highly intense light and with your amount, they are too highly elevated. All can be moved midway or preferabley lower. Except for the branching species, all of the other should be moved to the sandbed directly, including the goni. None of the non branching species will appreciate being placed within the rock work. It can cause irritation and possible necrosis. The branching one must be carefully placed so as no crown if too close to or touching rock.
The proximity of each isn't that bad but be sure to keep a good 4-5" space between them. More for the frog and anchora. Be sure to run your tank with carbon as often as possible and ensure the skimmer is running efficiently. All of these coral species have pretty good nematocysts and cause severe distress if allowed to build up.
Also be wary of excessive or directed water flow. These kinds of corals appreciate gentle flow and will recede or worse if there's too much.
The chemistry is not bad (although the salinity could go up a point or two) but I would allow the alk
to fall a bit closer to 3 mEq/l and the Ca
down to 425 ppm
. You don't appear to have a low Mg
problem so do not dose anything for that. On the subject of dosing, what have you been using to get the levels that high and how often?
One last thought, what salt have you been using and is it always the same salt each time?