Trying to identify this colony

[phigene]

Grown out from a frag. I have had this coral in my tank for so long I forgot the name of it (maybe I never knew to begin with), and I'm not even clear if its a milli, or a spath. Can anyone help? And maybe a lead on the morph? I just fragged it and would love to be able to call it something other than "that cool purple/green stuff"

Thanks!