I haven't heard of them really changing colour, so you are probably alright. Unlike SPS's which can be down right rediculous!
Hey, don't worry over something that hasn't happend. I would be concered with polyp extension and that stuff.
I found the yellow fuji leather, and I got a home grown one, just plain fussy. Something would touch it and it would be closed up for a few days.
In my 20 g tank with *lots* of light, I found it like semi shade, and about 8 inches from the MH. Now I still have 2 actinic VHO's and 1 NO 50-50 bulb. So it had plenty of light, just didn't want it that bright - for me it was more like a mushroom.
HIH,
Do the Bunny hOp!