What is this? Soft and spongy!

I have noticed two pieces of this growing between the LR in my tank (circled). It is soft and somewhat spongy, almost gelatin like. I first thought it is a frag of my star polyps but there is no polyps coming out of it. Can someone ID this and tell me if this is harmful to my tank? Thanks

 

dont have a clue

 

looks similar to some tunicates Ive got growing.

 

Aren't sea squirts considered invasive?

 

Here is a little more info on them...

Tunicates or Sea Squirts: A Wet Link

 

Possible a type of soft coral!
I don not see any atrial or branchial syphon to categorize it as a Tunicate, nor do I see anything conclusive to offer me circumstantial evidence to support my obeservation of it being a sponge of some sort!
Can you get a closer and clearer picture of it?

 

Maybe it is plating coral. I have seen plating coral like that before. They are semi-rigid. On the far right hand side of this pic there is some, but it is from an older colony and yours looks new.

Here is the pic:

 

Looks like some sort of coral in the very early stages of development.

 

Looks like a sponge to me, I have a bunch of those. Luna

 

Thats what I was thinking....