Sponge? Tunicate? Algae?

[alterboy21]

Please help me identify this.

It's light green, growing on my live rock.first noticed after I got some new live rock. There are now 2 - 3 of them. Each about an inch in length.

My tank is a Fowlr, parameters are normal (my nitrates do go to 20 - 40).

I am guessing spong or tunicate based on search g forums and Google. Don't know if it's a pest or I should try to remove.

 

[blaxsun]

Tunicate or sponge would be my guess.

 

[damsels are not mean]