Coral dying, other corals healthy

Icryhard

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So I recently bought a coral which looked like image A.
I placed the coral at the bottom of my tank, because the previous owner had that as well. There isn't that much flow in my tank down there though, anyways after a while one of its heads got some brown slime over it (see image B), which I assumed was dino. I then brushed it off and the head ended up retracting and hasn't opened since anymore. Now a second head is covered in this brown slime and I am hesitant to brush it off. All my other corals are growing very well and haven't showed any signs.
Info about my tank:

ph: 8,3
phospate: 0,9 (yes I know very high, I am trying to reduce it in a way that my dosing pump can inject the correct amount later on)
Magnesium: 1275
calcium: 440
nitrate: 10
nitrit: 0
ammonia: 0
oxygen: 6
alkanility: 11,9
water temp: 77 fahrenheit (25 degrees celcius)

Will the retracted head recover, and how can I remove this slime without causing any further damage?

coralgood.jpeg coral.jpeg
 

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