I think the color has something to do with water chemistry, as the stems I received from you are now completely green with a slight, and I mean slight touch of pink on the underside of the leaves.
I dont have any "technicall" data to support this statement. Maybe it's my lights 4.8wpg, 6700k, they tend to make things look more yellow to me.
You can see the plant on the right side of my tank in the photo album section, it's listed as 40gallon Breeder.
Oh yea, thanks again, as all the stems are doing extremely well.