Need this stuff gone

[Scallopking]

Does anyone know what will get rid of this stuff? I’ve manually removed some but couldn’t get it all. So far several tangs, hermit and astrea snails no luck. The rock is the base of a larger structure so getting it out to remove it is going to be a problem. Thanks.

 

[KrisReef]

Looks like Bryopsis.

 

[Scallopking]

Thank you, it does now that I search for it. Quick search doesn’t look like much will take care of it naturally. ?? Nudi ??