Coral identification

[WaterPumpkin]

Hey all! Not sure if this is the proper place but I bought a piece of a clam shell to put in my tank and it had a blue something or other on it. Seems alive so I'd love to know what it is so I can properly care for it

https://drive.google.com/file/d/0B2Gxh-0SbXKSMkw3MnA2c2VYU1k/view?usp=drivesdk

Thanks!

 

[SeaCucumberFan]

Some kind of colonial tunicate I think, won't last long

 

[lokmar]

I've got what was sold to me as blue sympodium polyps that look exactly like that when they're closed up at night. Let us know if anything sprouts up out of them. Mine are a solid medium/light blue when the polyps are out.