can hermits cause sps stn

[FLAMAANGEL]

so i have a 300G SPS tank, one of my yellow milli colonies started to STN/RTN
my water is, 1.025, nitrate 2.5, nitrite 0, alk 10, phosphate 0, mag 1450, cal420 and water temp 77-78F.
i recently got 100 zebra hermits and noticed some chilling on this coral, next thing this coral goes STN. can hermit crabs irritate the coral to the point of STN?
i had this coral for three weeks and it's from bali mari cultured.

 

[Elan L.]

was it STN or just mucosing? Sure they can irritate it but i doubt they can cause tissue necrosis. Usually hermits only "bother" corals that are already bleaching (kind of like cleaning off the dead stuff)

 

[FLAMAANGEL]

was it STN or just mucosing? Sure they can irritate it but i doubt they can cause tissue necrosis. Usually hermits only "bother" corals that are already bleaching (kind of like cleaning off the dead stuff)

the skin was coming off and showing bare skeleton, from bottom working up.
slow two days already, no other sps effected.