Acropora pest or not?

[Sneaky Pete]

Hi everyone, I recently purchased 2 acropora and noticed some weird creatures attached to them. They were very well camouflaged, almost matching the color or pattern of the sps. Any idea what this is and should I have removed it? I'm attaching a few clips before removal and after and some photos. The after clip shows a pretty big gauge in the coral left from removing the pest. I had 3 on one acro. The second acro still has it and it is much bigger. Judging the gaping hole it left it must be a pest but would appreciate some help. I cant find any YouTube videos on this.

 

[Sneaky Pete]

These were fresh out of a dip so no polyps would be visible

 

[billyocean]

Looks like barnacles

 

[Sneaky Pete]

Looks like barnacles

Mucho gracias! You can always count on Billyocean!