Normal for GSP to dissolve around injury?

[Scooter12ga]

Hello all,

I have a GSP frag that is about 1 month old. All the while it has seemed healthy, opens up daily, etc...

The purple mat, however, is receding from the areas where it was injured in fragging. They are growing on a dead SPS skeleton. Were it was broken off and where it cracked during mounting, the purple mat has died back about 1/4"+ from those areas. In the uninjured areas it is growing new mat and new polyps just fine.

All water params are in check:
NH3/4 = 0
NO2 = 0
NO3 = 0
pH = 8.4
Alk = 9dKH
Ca = 420
Temp = 80f
1.026

The two dying areas are where I used a couple of drops of superglue gel to mount the frag and to repair the crack after mounting. Does GSP not like superglue, even several weeks later and when I didn't glue the mat but the rock underneath?

Is it possible that there is something like a bacterial infection at the injured sites? Should I dip them in Lugols or something similar?

I've looked at night for something eating them, nothing obvious. I can take pictures if you want, though there isn't anything noticable in the pictures, only a time lapse shot would show how the mat has receeded in these two areas.

Other tank inhabitants(distance from GSP):
Xenia(4")
Small blue mushroom(4")
Colt(8")
Green Zoas(8")
Frogspawn(10")
Brown polyps(24")
RBTAs(12" & 36")
Cleaner shrimp
Chromis
Snails & Crabs