It looks like a Captain America Palythoa which is a soft coral. Many of these Palythoas and Zoanthids carry a toxic and potent Palytoxin than can cause vasoconstriction and other more severe issues including death.
i don’t want to scare you but it is in your best interest to read about Palytoxin to inform and be proactive.
Zoanthids are beautiful corals that can add awesome color and diversity to a reef tank. Just know the facts , be aware but enjoy. There is NO reason not to add these to your tank. Yes, there comes a risk with having them, however, there are risks with having a dog, reptile, chain saw or pool As well.
good luck...