"Moss Ball"-Macro?

[Surfthaearth]

I recently purchased some Macro from my lfs. They had it labeled as "moss Balls"-Macroalgae. It looks a lot like Chaetomorpha....which is what I was trying to locate. Has anyone ever heard of this nickname for it or could it be some other type of macro?

[RicksReefs]

i used to see these when i was in the trade years ago.
i don't really remember exactly what species they were,
but one thing i do remember about them is that they were
loaded with little mini life. baby crabs out the wazoo, mini
brittle stars, pods, etc. (keep an eye out for bad crabs popping up.)