Green Spongy Thing w/ Tube coming out

Any idea what this is? They are growing on my FrogSpawn Coral and they popped up a few weeks ago...





Any help would be great!

Thanks

Chris T

 

Anyone have an idea?!

 

I would say its a sponge

 

Good or bad?

Thanks for answering btw.

 

So I went to my LRS and they think its a Sea Squirt, would any of you agree?

 

I wouldn't. It's a yellow sponge of some type. They often have a transparent siphon on major lobes, near the center of the mass. I have a few in my tank, they're generally a good sign, and don't do any harm. They will usually only grow when water quality is very high and you have enough natural planktonic life growing in your tank.

I can get pics later... but it is almost certainly a sponge and not a squirt or tunicate.

 

Agreed it's a type of sponge...fairly common hitchhiker...we have them growing in many of our sumps.

 

Thanks!