growth

[Pina5832]

Hello all
Hoping someone can help me w/this.
Found this growing on a coral rock. Can someone help ID this? Good or Bad? Moving this coral 2 a larger tank do not want it tagging along

 

[Reeftub]

It's a sponge which is good and will help filter water. Let it grow, it may shrink or disappear if it doesn't get enough food.

 

[billsreef]

[moved]...