Urchin somehow

[Mombo]

I have no idea how it got in my tank but I just found an urchin.

Anyone know what kind? Reef safe? What should I expect in the future?

First urchin...

 

[Mombo]

Looks like it’s this one - Echinometra mathei

 

[Salps]

I have never known an urchin to do anything more than knock over unglued frags and eat just about all types of algae down to bare rock. I love mine. Some don't like them because they accidentally knock things over and do eat coralline algae.