What is this? A sponge?

[Dblue351]

About 2 weeks ago this started growing. I have looked all over the Internet but can't figure out what it is. Anyone know? The tank is about 2 1/2 years old.

 

[Dblue351]

One more

 

[Michael Hoaster]

Does it have lots of tiny holes and fewer bigger holes? If so, sponge.

 

[Dblue351]

Doesn't look like it

 

[Michael Hoaster]

No holes, not sponge.

Can you get a closer pic?

Maybe it's one of those cool macro algae that fluoresce!

Anyway, it looks beautiful!

 

[Bent]

Tunicate colony?

 

[cloak]

It might be some sort of red macro algae.

http://www.saltcorner.com/AquariumLibrary/browsegroupspecies.php?GroupID=105

 

[Dblue351]

Based on the photos I think macro algee it is. Thanks everyone!