This is really weird need ID please

[Ripnlips82]

 

[janiners305]

Looks like a blue sponge to me

 

[Ripnlips82]

It changes color and is hard like epoxy not soft like a sponge. Are there hard sponges out there also?

 

[Chrissy]

Looks like a blue plating sponge, Collospongia auris.

 

[SeahorseKeeper]

Looks like a blue plating sponge, Collospongia auris.

+1.

 

[Ripnlips82]

Wouldnt it be soft then? This thing feels really smooth like glass...

 

[Ripnlips82]

Nobody has run into this before? I have considered a sponge but doesn't really fit since its hard and smooth.

 

[Reefing Madness]

Plating Sponge, as suggested above.

Blue Photo Sponge, Collospongia auris, seems to be growing well in reef tanks