Thanks griss. Good to get a corroborating opinion. Nice to hear it doesn't get out of control too.
It's an interesting macro for sure. In my tank, each individual stalk doesn't seem to be long lived. New stalks crop up, die out and others crop up...lather, rinse, repeat.
I have noticed that when I change out my GFO regularly (yes, I've been horrible at maintenance the last year or so) it (along with the Codium sp) will disappear for a while. If I don't change the GFO for a while, both macros will make a pretty good comeback.