White tubes growing on rocks

[stevejar]

Just noticed these popping up on a lot of my rock. Tank has been running for about 7 months. Anything I should be worries about?

Thanks!

 

[BeltedCoyote]

@ReefSquad

 

[kyleinpdx]

are they soft and squishy? probably sponges but I cant quite tell from the pictures.

 

[stevejar]

are they soft and squishy? probably sponges but I cant quite tell from the pictures.

They do seem soft and will move when the current hits them

 

[KJ]

Sponge.