Strange Spiked Growths

[WheatToast]

I have absolutely no clue what these things are. They came on some LFS live rock, which I believe originated from the Indo-Pacific. They have no holes, feel quite tough, do not bend, and have small “tufts” on their spikes. They also do not appear to have grown since I introduced them a few weeks back.

Does anyone have any idea as to what they are?

 

[JGT]

Porifera sponges.

 

[WheatToast]

Porifera sponges.

Doubt it. The hitchhikers are completely solid.

Edit: Plus, they don’t have holes either.

 

[happyhourhero]

Foraminiferans ​

 

[WheatToast]

​

Foraminiferans​

I think that’s it! Now that was very unexpected! Thank you so much for the ID! What are their care requirements?

 

[Isopod80]

+1 Forminiferans. They filter nutrients from the water with those tufts. I have the same variety in my tank as well. Harmless.