Does this crab need to go on the naughty step?

[Reef.]

Is this crab trying to eat the poor urchin?
It’s not the first time the crab has jumped on the urchins back, yesterday it did the same thing, I knock the crab off, the crab is picking at the urchins back, not sure if it’s just picking of detritus or actually trying to eat the urchin?

(anyone know how to edit the title of a thread, misspelled crab)

 

[Cell]

I would guess the urchin picked it up and it's shell is stuck, but not certain.

 

[Reef.]

I would guess the urchin picked it up and it's shell is stuck, but not certain.

It’s not that, the crab is definitely wanting to be on there.

 

[kevgib67]

I would have to go with cell, mine picks up snails all the time and I have to remove them. I suppose if your urchin decorated itself with something tasty then maybe. Nice halloween crab.