Acro crab?

[GreenSpottedPuffer]

I just picked a nice new Tabling Acro and during acclimation noticed a little hitchhiker. Beautiful little crab. Just trying to figure out if its safe or not.

Its quite small but I will try to get a pic. Its got purple legs just like the color of the acros tips and it has a bit of red on the tips of the claws. The thing blends in with the acro PERFECTLY. I figured it must be fine and will never leave that piece anyways but just wanted to ask now before I add it to the tank.

Thanks!