bleaching or changing..

[unit15]

Ok so about three weeks ago I purchased a small colony of sps. When I bought it it was brown tbut my lfs said it was wild collected to it will change to a different color under your lights. Well its doinng something but I can't tell if its bleaching or changing lol.

The ends are getting lighter but more of a pinkish blue, not white and the polyps are sill opening... her is the best pics I can get

 

[Ckyuv]

Kinda hard to tell but it looks like its just changing colors. I think if it was bleaching it would be turning more white than blue.