What is going on with my candy cane coral

[Teen reefer]

Hello, I had have this reef tank for about 6 months now and everything is doing great but I noticed that my candy cane coral started to have these weird things on it and I wanted to know what it was and how to get rid of it?
Alk 8.4 dkh
Cal 340 ppm
Mag 1300 ppm
Nitrate 2 ppm
Phosphate.03 ppm
Salinity 1.025

 

[P-Dub]

Mystery there! Can you get a closer shot and under white light?