Green Birdsnest Coloring

[Baldy]

I had a quick question regarding my green birdsnest. Ive had it in my tank for over a month now, its growing very well, and always has polyp extension. Lately ive notices that the inner stalks arent as green as the tips are. Is this normal? Its a bit hard to see in the pic, but you can see the color difference between the tips and the rest of the frag.

http://i924.photobucket.com/albums/ad90/Forced__Induction/c55d7385-d6c6-4940-bcb6-b61e7f134c50_zps080f8301.jpg

[Corbin]

yeah its normal, mine varries from whiteish to brownish, the polyps are neon green/blue though