Please help me identify

[KoTS]

Growing underneath my favia. Looks like a branching sponge? Any help identifying is greatly appreciated.

 

[Crabs McJones]

Yup sponges. If they're bothering the coral you can scrape them away

 

[reefiniteasy]

You are correct that it’s sponge but I have no idea what kind. They grow under my Eagle Eye Zoas. My Emerald Crab took care of it, he devoured it.

 

[KoTS]

Thank you! They don't seem to be bothering it but I was going to get an emerald crab anyway. So maybe a snack to start him off with!

 

[ahiggins]

These are a pain. Yes they’re sponges but they’re not like the “ok” sponges that grow in dark corners/sumps. These will grown around your zoa mat/soft corals and strangle them/kill off the mat. I always remove because they thrive in higher light.
That being said, they won’t hurt a hard coral that much unless they start growing over the skeleton and into the fleshy bits.