Ever see this before?

[Ka0s]

So crab has actually gotten inside with the wall frogspawn and is just chilling. Spawn seems to be fine with it, still fully open.

The crab is a new addition about 2 weeks in now.

 

[KJ]

If it doesn`t bother him I wouldn`t worry about it.

 

[Cody Paulsen]

Is that an emerald crab? Those guys find their way into the tiniest crevices. I'd keep an eye on him, but if the frogspawn seems happy, I don't see any issues. Emerald crabs aren't known to nip at corals, as far as I know.