Can anyone identify this?

[Badnade]

From what I can tell these are sponges. They are growing on my green star polyps and there is one under the polyps of my acan.

What's the best way to eliminate these so they stop growing on my coral?

 

[Dw79]

They look like Pineapple sponges. I use a pair of tweezers after lights out while the coral is closed up

 

[fishguy242]

hi,pineapple sponges,pick off stars,gently brush off w toothbrush "gently " not to damage stars

 

[Badnade]

Will they spread if little pieces of them get in the tank water?

 

[Katrina71]

I let them go away naturally.

 

[Badnade]

I let them go away naturally.

How do they go away naturally?