?????????

[shogun1964]

Iv'e got these things popping up all over the place, any ideas what they are?

 

[shogun1964]

another one

 

[SmokeyGnar]

Sponges? They look pretty cool

 

[saltyfilmfolks]

Macro algae. I couldn't find it earlier.
Red candelabra macro was the closest hit.

 

[JaimeAdams]

red decorative algae

 

[Tahoe61]

Look like Red Valonia to me.