Leptoseris Polyps or Pest?

[eigenbot]

I got this leptoseris frag almost three weeks ago. It has had these little white/purple things on it the whole time, only in this one spot and a smaller second spot. They're usually about the length in these photos, but I've seen one or two long and stringy ones occasionaly (can kind of see one in the back right of most of the photos - that longer skinner thing as similarly coming from the coral. I've dipped the coral in coralRX and seachem reef dip about a week apart, and the white parts shrunk up for a while then came back out.

Are they just polyps? If so, is it strange they seem so localized to mainly one spot? Are they some kind of pest I should be trying to remove before I move them to my main tank?

I initially thought they were some kind of pest since I didn't see similar pictures when looking at them online, but have since seen a couple from online coral listings that look similar, like the one below:

 

[thamnasteroid]

Tentacles prolly

 

[biotex]

They're sweepers, coral might be hungry.

 

[Tcook]

^^^ yes, or sensing a rival. Not a pest.