When you say Green Flame, are these the same as Green Fire, Aphyicharax rathbuni?
If so, be careful when you select them, I have seen a lot of very 'crooked' ones lately with nasty bent spines.
I have two, they coloured up really well when they settled into our tank, they were a bit washy when I first got them, but they had a bit of a long winded journey before we got them!