Tiny Urchin?

[MPCReefer]

Searched but could not find any posts with this type of question/photo. I just discovered this last night on my new live rock and see it again tonight. No sightings during the day, but this is about the size of a pencil eraser. It looks like a small urchin, but I have never seen one this small. Any ideas/confirmation? Or is it something I do not want in the tank? TIA

 

[fishguy242]

hi,looks like a sm rockboring urchin ,imo,bonus ,good cuc :)

 

[MPCReefer]

Very cool hitchhiker. Thanks.

 

[vetteguy53081]

That red light makes it impossible to determine what it is
Looks like an aptasia to emphasize the difficulty under red light

 

[MPCReefer]

That red light makes it impossible to determine what it is
Looks like an aptasia to emphasize the difficulty under red light

True, but it's the only way I could get a photo. Definitely not aiptasia as I have only observed after lights out and it does move slowly about the rock.

 

[vetteguy53081]

True, but it's the only way I could get a photo. Definitely not aiptasia as I have only observed after lights out and it does move slowly about the rock.

I’m sure it’s likely urchin.