Mine 2 never ate greens at first but I was not too worried as they were eating LOTS of livefood at the time.
What I did to try and encourage them for the future was to put mealworms etc on top of the greens and as they were lunging at the worms they were occasionally getting some greens and it finally got to the point where they were actually going for the greens as well, Hope that makes sense. Now at 5 or 6 months old they eat lots of greens as well as the live food.
The Devil Made me do it!!