yeah looks like a little bleaching, but I wouldn't say they are "goners". .
What KIND of lighting is your 250w? PC? VHO? MH?
For your information I had a green favites and after about 3 weeks started to look stressed/unhealthy. I had 220w on my 55 (PC lighting) and I gave it away to save it's life. After a couple weeks in MUCH brighter lighting the guy said it's doing great in his tank!
So just based on my limited experience, I would say lack of lighting. I was SHOCKED and wasn't prepaired (based on what some LFS have told me, they AREN'T easy corals). . I found out they need ALOT more lighting, than I originally thought. I would assume 400w VHO/T5 would be the bare minimum for most brains.