Euphyllia (wall hammer) damaged

[Kelp]

Hi all,
My wall hammer has been acting strange after a water change, I may have damaged it while siphoning but cant be sure. A piece of skeleton is shown, with a tiny bit of white fuzzy stuff on it. It has been a week and no change, should I break it off the rock and dip it or just wait it out? I have dvh coral protec and fauna marin the dip.

My parameters:
Po4: 0.034
No3: 2.5
Dkh: 8.2
Calcium: 440
Magnesium: 1530

Its been in the tank for 3 months.

 

[Clowns-corals-cats]

I can't see anything to concerning. All my hammers acted funny last water change for an hour or so after. Sometimes any little swing in temp or salinity or something they just do that's should be fine