Little help to ID these white things

[mcga]

Hi Reefers ! Happy Friday to all.

I tried to ask Google and Claude before I bother you but they don’t know what this white thing is !

So I am seeking some help :)

I’m more interested in knowing what are these white things …

Thank you so much

 

[JGT]

Pineapple sponges. Harmless.

 

[EnterName]

Looks like a duplicate post so I just quote myself. JGT is correct:

Sycon sp. - Pineapple sponges (Third post on page 5 for mobile users, overall post 83)
Harmless / beneficial filter feeders.