Barnacle?

[jdubDaReefGuy]

I got this frag today and didn’t notice until after I glued it down, but is this a barnacle growing on the plug? If not what is it? Friend or foe?

 

[IKD]

Agree, barnacle

 

[Sophie"s mom]

I got this frag today and didn’t notice until after I glued it down, but is this a barnacle growing on the plug? If not what is it? Friend or foe?

Yep!