Are these hydroids??

[reeferparty]

I've noticed brownish lint like things attached to my rocks/zoas..I've been doing some research and they don't appear to be colonial hydroids but could they be digata hydroids? I've tried blowing them off with my turkey baster and some blow off but majority stays attached. They don't feel hard to the touch. @twilliard I hope you could chime in

 

[Tahoe61]

Those are harmless pineapple sponges, I do not see any hydroids in any of the images provided.

 

[reeferparty]

Any other opinions? Here's another pic

 

[saltyfilmfolks]

I agree and she is usually right as well.

 

[BrunoSnow]

In the third photo yes those are hydroids

 

[Tahoe61]

Those are hydroids, but again your first images show pineapple sponges, not hydroids.

 

[reeferparty]

Those are hydroids, but again your first images show pineapple sponges, not hydroids.

Do you know what kind?