I need help identifying coral!!

[surfandshine77]

This coral was on my live rock when I purchased it and i need to know what kind it is so I can take care of it properly! Please help!

 

[hawkfish203]

P

 

[hawkfish203]

Purple sponge possibly

 

[surfandshine77]

It's really hard to the touch though

 

[Mike2112]

What's this one true name,,