What have you done/changed over the last 2 or 3 months ?
I know with my tank I've run into problems that caused some hair algae.
From there, my corals started to suffer as I didn't address my higher-than-normal PO4 and I not only got some browning corals, but I also ended up with a fully blown out GHA issue. It was everywhere and out of control
I lost a couple SPS during the battle. Some due to GHA, and some due to my over-zealous hydrogen peroxide dosing ... my whole tank went into shock after I decided to kill every last living spot of GHA I could see.
It worked for a couple weeks, and my corals are coming back, but I'd not do it again so aggressively
I ended up doing a lot of small carbon changes to try to remove whatever happened to my tank as I still have no idea what happened.
Near as I can tell I killed a bunch of bacteria ..
Regardless, if your corals are upset, carbon is your friend
My softies survived all this just fine, as they will mostly do
Hi PO4 can upset SPS, and so can fluctuations in salinity and Alk
As Brad stated, your Ca is a bit low, and IMHO your Alk could be a tad higher.
I like to try my best to hit 7-8 Alk, 410-420 Ca and 1350 Mag
Keeping your Alk just a tad higher (7.5) gives you the wiggle room if your corals start to use more. Keeping it @ 7 is OK, but if they use more than normal, it can dip too low before you know it
The best thing you can do is keep it stable for now and, as I'm doing, ride it out and see if things turn around
Good luck dude
