Blue coraline ?

I recently remove the rock out of my old tank to scrub algae off and, cut some in smaller pieces, and in one of the rocks this pop out. any ideas if it is Coraline is in the rock and I don't think is algae, not sure.

 

I don't think it is based on the shape of the first rock, and it almost looks spongey on the second one.

but blue coralline is definitely possible.

 

hmm i have no idea but i will say it def looks cool lol

 

I vote for sponge... however coraline is possible!
I have seen purple, pink, red, maroon, orange, green, brown, grey, and off white before

 

Sponge gets my vote as well.

You can tell for sure by touchng it. Coralline is not easily removed.

 

Dead Heliopora spp (Blue Ridge Coral)

 

It doesn't come off from the rock it is hard. It is actually the inside part of the rock , like the inside of a tree bark kind off, the little piece in the front, may be a sponge . I like it dough it looks cool
Thanks

 

It doesn't come off because it IS blue ridge coral. The skeleton is blue.

 

Sorry. I've turned into a crabby old fart in recent days. I could have used more "finesse" in disagreeing with previous posters.

 

You saw it for what it is ;D

I was sure it was sponge, had not even entered my mind that it was a blue ridge. While I used to see the dead skeletons everywhere several years ago, I just do not see it much anymore. Good thing I suppose.

Anyway when your right, your right, inwall.