Is this harmful?

[TheReeferd]

Saw these lil feelers coming off this coral. Is it some parasite or a feeding mechanism?
Also, anyone know what is the scientific name of this guy?

194905

[Devin98]

Totally normal for these guys, it is a Favia coral.

[reefer999]

Yeah, those are it's stinger tentacles, just watch out as it may hurt some of the nearby corals.