Leather coral looking sad

[ChromeSplat]

Hey guys, my leather coral hasn’t looked happy in what feels like a month and some change. Any advice? All other corals seem happy and are growing.

Tests from this morning

12/18
Calcium - 420
Alkalinity - 8.3 / 1 mg dose
Magnesium - 1200 / 10 mg dose

It does look like there’s some small new growth at the base. He hasn’t fully opened in a while which is a bummer as I’d like to add another leather in the middle. Anything helps!

 

[MossyFroggyLove]

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[Gumbies R Us]

Photos of the coral? and a FTS to see where the coral is

What about your lights and flow?

Any recent changes?