What is this thing that was growing on my Crocea Clam?

[ThEfIShdude]

Hello, I had found this a couple of days ago growing on my clam. It seems it had grown to this amount in a couple of days. Also my clam is in decent flow but seems to love it, I don’t know if that could help with the IDing of this critter. It was growing on the shell in many different places, and the biggest pieces hung on tiny threads attached to the shell of my clam. Any help is greatly appreciate, thank you!

 

[vetteguy53081]

Pics very fuzzy but may be pineapple sponge
Is the objects moving?

 

[ThEfIShdude]

No