Identify please

[Tom Blevins]

Hi All,
I have had this pop up in the last month and I think it's a sponge
but asking the experts, one thing my Acro's don't like it and recede
when they come in contact.

Any help would be great and or something to eliminate the problem.

Tom

 

[steelheader.262]

I would guess some sort of Sponge.

 

[Tom Blevins]

Thanks steelheader.262 I sure hope so, any other comments welcome too:)

 

[Lionfish Lair]

I believe it to be a tunicate. In the photo, the area within the red circle, that pattern is usually found in tunicates. The arrow points to a repeat of the pattern, so it's not just a fluke.

The blue points to several siphon type structures. Again, the fact that it repeats, indicates it's a structure and not just an illusion.

The yellow also shows a siphon that has white dots around it, there's a type of tunicate that has that.