My guess is paly, I'd keep it. As long as it keeps growing in the same way, developing a "matt" and budding like other zoa/palys then it's just a morph with longer skirts, try moving the rock to a lower/ almost no flow area. Then watch it for a few weeks or so.
It's also lacking that translucent skin tone that most anemone's have, it's more like the gray'ish texture my nuclear greens have.
However if individual buds start popping up in random spots....then well it's bad and needs to die.
If it is a paly, how much are frags and when can I get one?, the skirt is crazy on those.