Identify Yellow Thing?

[Bellesfish]

hi, would anyone be able to identify this yellowy white thing on my rock? It’s around an inch long. It was in my nano but I’m moving everything over to the big tank so curious whether to add this or if it’s something I shouldn’t be adding. Thanks a lot

 

[Tony_097]

Is it moving or pulsing in any ways? It might be a sponge but I’m not sure though.

 

[Bellesfish]

Is it moving or pulsing in any ways? It might be a sponge but I’m not sure though.

No it’s not, I think it is a yellow sponge

 

[Tony_097]

I'm betting on either sponge or tunicate

 

[coralbandit]

I was thinking tunicate myself ..