torch coral .white things underneath

[Reef257]

Hi all
Hope everyone is doing good.

I'm amateur reef .I got load of question Sorry for the trouble .

I baught a torch coral recently the the base of it was look ok.but today I noticed that the is somthing white coming up towards the tenticals. Bit scared

Not sure if this is ok . Does torch get this .
Or my torch is dying anything I can do to help it .

 

[Reef257]

these are the picture

 

[Jamesrup0411]

Picture

 

[Reef257]

Picture

Pic

 

[Reef257]

Now this like this
Anything to get worried about

Current tank
Ph .8 0
Alk 8.4
Cal 450
Mag bit high 1500
Phosphate 0.03

 

[vetteguy53081]

Moderate light and water flow
Salinity 1.025
Temperature. 77-79
Ph. 8.1-8.3
Alk 8-9
Mag 1300
Ca. 450
Lower third of tank for placement