Please Help

Humuhumununu

Reefing newb
My Teninus acro frag has started to whiten around where its polyps are. The polyps toward the top have receded. It was on the sand bed receiving some flow and was also not getting stung by anything. I thought about an Alkalinity spike, but I only added about 10ml to my 130g system an entire week and a half before. The frag has been in the system for about 3 weeks and was fine until about a week ago. The chemicals are near perfect and are as follows:
Alkalinity- 9.2
Salt- 1.025
Calcium- 430
Magnesium- 1500
pH- 8.0

Anything you guys know would be much appreciated. Thank you.
 
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