What is growing on my pipe organ?

Sort of greenish bulbs. There are a couple of others that seem hard. One right below the light green one. This one looks newer.

 

Green Bubble algae maybe , Looks like dark green marbles ?? Photo does not show much other then the corals

 

I know what bubble algae is. Wasn't sure if it was good since it seems like there are others but older and hard.

 

After more careful looking, I have many more. Probably 3-4 on the pipe organ, and one growing next to it on a rock. Sends out root like things to anchor it self. Soft material. Plucked one and tried to take pic, but they didn't turn out very well. Will take more pics tomorrow, but it looks just like the pic.

Light green spongy stuff with threads or roots coming from it.

 

ha ha - i think you have answered your own question

 

Looks like Bornetalla sp to me but it is hard to tell from the pic.

bornetella sphaerica - Google Image Search

 

Has some similarities of Bornatalla, but it isn't. It isn't green like photosynthesis plant material. It is light green.

Don't know if it is sponge. The strings that come out come out in all directions. I assume looking to grasp on to something. Obviously I just want to know if it is harmful. At first it was just one on the pipe organ, then saw more. Now it moved to a rock. does not appear to be growing super fast.

 

Not trying to be rude, but thats a poor assumption. Photosynthetic algae's come in many shapes, sizes, and colors, let alone shades of green.

 

Very true. Thanks for the correction. However, the pics that were so kindly posted, do not match what I have.

 

I want to say its a sponge, but not 100% sure. Luna