What is this in my refugium?

[MACHO]

Hey guys just sorta wondering what these clear things are I’ve taken out a lot of them from my water change they were in my sump and these are in my Refugio almost look like clear plants you can see one it’s underneath the rock no idea what it is

 

[twhit030]

Not the clearest picture maybe a little closer pic would help but if I’m seeing what you’re seeing it looks like the very beginnings of a feather duster

 

[TnFishwater98]

Probably a sponge but would need better pics