What are these??

[Reefing Reefer]

I started seeing these white sponge looking guys on my leather coral (on the plug) a couple of weeks ago. Since then, I’ve seen more and more smaller looking critters pop up in my heater (back chamber) and on my algae scraper. They don’t seem to hurting, a little bit of an eye sore, but I’m more worried about a breakout since they seem to be spreading.

 

[Jekyl]

White light pics please

 

[Rtaylor]

I am able to make out some spirorbid worms if that’s what you are referring to? If so they are harmless.

 

[Reefing Reefer]

Is this better?

 

[Cell]

The big puffy things are sponges. The small circular hard things are spirorbids. The pic of the algae scraper is too blurry to see what's going on there.

 

[Tuan’s Reef]

spirorbid worms. Harmless

 

[Rtaylor]

Is this better?

Yes, for future reference, always turn off blue lights for taking photos.
It’s a pineapple sponge, harmless filter feeder.

 

[Reefing Reefer]

Yes, for future reference, always turn off blue lights for taking photos.
It’s a pineapple sponge, harmless filter feeder.

Thanks!