Sps health questions. 1 has STN and the other looks brown

Miami Reef

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The first one looked like the base was peeling a week ago, and the tip also has some bleaching. I kept an eye for 1.5 weeks and I don’t see any further issue recession.

The second coral looks brown/greenish.

I will say that these corals are near a power head and a large cloud of soda ash blows directly onto the STN/RTN coral. I started dosing alk and cal into sump and I *think* it stopped ever since.
 
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Zer0

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The second one looks like it has algae grown over the dead tissue, which probably won’t grow back now. I would frag whatever you can to try and salvage it, but honestly it doesn’t look too good.
 

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