Is my lps Bleaching or is something eating it at night?

W28LF

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Goodmorning,
I just bought two lps on Sunday, a hammer and a chalice. It did well the it ate a pretty large amount of food on Monday, but on Tuesday i noticed two white spots on edge of the coral. I also noticed a hermit crab next to it but it was scavenging on the dry rocks. I observed it on Wednesday when i came home nothing changed so i was a bit relieved. Thursday this morning the two white spots are now a white area. I did have it in the middle of my tank on a ledge, now i moved it to the bottom. Is this bleaching or something in my tank eating my hollywood stunner chalice?
Ph 7.8 -8.0
Nitrate 0
Nitrite 0
Amonia 0

20201105_050650.jpg 20201103_194017.jpg
 

Spare time

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Its not the hermit. I am wondering if it is because your nitrates are 0.

Can you also list your alk and calcium?
 

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