Yet another ID...

[Bubbles]

I bought this piece as a small frag about three years ago. Since then I've sold a few frags of it and have always wondered what it was.

It started its life a slight green color with brown polyps and changed to white with blue and or purple tips for a while when I was running ultralith. It also has had sort of an encrusting feature and would grow accross the rock it was on then one day just started to sprout upwards. Now, and since about November when I started running GFO and Bio Pellets it is turning white with blue and purple tips again.



I assume that its some sort of acropora but have not been able to percise exactly what it is. Your thoughts on what it is?

Cheers
Jeff