Aptasia or Featherduster ?

[yellojello]

Can someone help identify this? There are a few randomly spread throughout the tank. Some of them tend to close up and look like a cotton swab.

The one in the middle is open, and the out of focus white egg in the background behind it is another that is closed.

 

[phishphood]

Doesn't look like aiptasia to me. Sponge maybe?

 

[GreshamH]

Sponge.

 

[yellojello]

Cool. Thanks!