White sponge ID

[Stonecrab]

i am looking for confirmation on type of sponge as well as what to do about them, I’m not worried as they are in my quarantine system, just curious as to eradicate or propagate lol, see attached below

 

[Stonecrab]

Bump

 

[Stonecrab]

Anyone know the ID on these?

 

[Spare time]

I am curious too. Might be handy to move this to hitchiker

 

[Gmantu]

I have the same thing. Anyone I’ve an ID?