Please can anyone help me identify what this is?

[hanahandbluey]

Hello please can someone help me identify what this is? And how to care for it?
Thanks a lot!

P.S I call it the "Raspberry" Cause it looks like one.. It breathes from time to time..

 

[mr_X]

its most likely not a coral at all. possibly a tunicate. hard to tell from the pic.

 

[Badfishofbabylon]

It looks like a type of sea squirt.

Here's a pic of a big one in my tank

 

[mr_X]

tunicate and sea squirt are one in the same.