What is this??

[Martin Feeney]

OK, have something new growing on my live rock. It's about the size of half a grape. It is red brown, and the paler markings on it are orange and slightly indented. Anyone want to hazard a guess as to what it is (Ignore the hair algae!) . Texture somewhat like pig kidney.

Tank has been running continuously for 15 yrs, is mainly Fiji live rock, and I have not seen one of these in here until now.

 

[Dsnakes]

That’s neat. Can you get a picture with white lights? That may help. Some sort of sponge or tunicates maybe.

 

[KJ]

Look like sponge.

 

[Reefing Madness]

Sea Squirt?