White growth growing from blastomussa frag

[Marinereefiner]

Hello,

For several months now I have noticed that there are white strings almost worm like that are growing from the bottom of my blastomussa frag. They are growing out from it and the surrounding rock work. I have tried to research but cannot come up with a definitive answer to what it is. Assuming it is some kind filter feeder. Don’t think it is part of the blasto?

Any ideas? Doesn’t seem to be affecting the blastomussa at all.

 

[Reefing Madness]