Closed head on torch

[Kmst80]

So i got this torch 2 weeks ago and it looked happy until i noticed yesterday that one of its heads was closed up. Thought i leave it for a day and it might open up again but same today after 24 hours. All other heads seem to be fine.
Now yesterday i was dosing red sea foundation Alkalinity to get the Kh from 8 to 9, not sure if that influenced it( i noticed the closed head just after, could be coincidence though).
Two days ago i noticed the coral beauty had two scuff marks on its head , wonder if it has to do with the closed head.
Hope its not BJD.

Parameters:

Salinity 34ppt
Ph 8.2
Phos 0.06
Cal 479
Mg 1480
Nitrate 5

Pics

 

[NowGlazeIT]

I think it was your alk swing, that or maybe your light has a hotspot right there. Could be a number of things really but those two came to mind first. I really hope it’s not your Angel fish but they do have a reputation for gobbling up coral

 

[Kmst80]

I think it was your alk swing, that or maybe your light has a hotspot right there. Could be a number of things really but those two came to mind first. I really hope it’s not your Angel fish but they do have a reputation for gobbling up coral

Thanks for the reply.
My first thought was to big of a alk swing too.
I will keep an eye on it, the other heads still look happy, frogspawn in the same tank looks happy too.
I will keep an eye on the angel in case too, and be more careful when dosing alk.