I have 3 acropora frags that have now changed colors after a month.
The first is the center bottlebrush acro that was originally white. It is now green.
To the left of the bottlebrush acro is a millepora which was originally yellow and it is now green.
To the right is a small acro that was a peachy rusty color which is now green with brown polyps.
Here is the what the white bottlebrush use to look like.
Pictures of the original
yellow millepora and
rust acro can be found at Ocean Aquatics website.