What can be the issue

[Wiringwizards]

Good evening fellow reefers, so I have added a few new corals. There are 2 that well I'm concerned about. A pink acropora that still has polyp extension but is turning white at the base. And a candlelight acropora that has lost its green color and the green polyps at the base are retreating it looks like. Also looks like there are little white spots at the base.
Any advice would be helpful I am new to reefing.

 

[Hitman]

Might want to repost this in the SPS section. This is the predator fish section and I suspect you'll get lil to no help here.
I know they will all want to know all your water parameters, age of tank, flow, and changes, etc. you'll have a ton of awesome people to help you in the proper section. Best of luck to you and your corals.
Looks like stn from ALK swing to me tho.

 

[Wiringwizards]

thank you I will