Sponge Under Monti Frag?

[Trenton Henderson]

Trying to identify what this is. I have been recovering this slow burn Monti frag for a couple of months and noticed a sponge-like growth underneath it. It’s not a nudibranch and it doesn’t move, just grows. Let me know if you can ID!

 

[shakacuz]

definitely sponge. seems normal to me

 

[ISpeakForTheSeas]

Yeah that's a sponge - unless it starts growing up over and smothering the coral, it should be a harmless filter feeder.