Filter Feeder Identification

[DraggingTail]

Does anyone know what these are? See the white tube thing in the center of the pic.

I have them all over. I just noticed them and they are everywhere now that I looked hard. They are under the rocks in the shadows. I counted at least 50.

Do they pose an issue?

 

[ndrwater]

Pineapple sponge. Good thing.

 

[DraggingTail]

Pineapple sponge. Good thing.

Awesome. Thanks. There are even more than I thought 100 maybe. They are well hidden