I have searched for an answer to this one, but was unable to find what I was looking for. I'm hoping you guys can once again come to my rescue.

I have two different NOID Dendrobiums. One has all leaves tinged with red; the edges and the line down the center (is there a name for that?) are an especially deep color of red. From what I've read so far, that's normal, right?

What I really need help with is the other NOID Den. It is a small plant started from a keiki I was given last summer. It has one new growth this year. On the new growth, the leaves have a red tint on the edges, and there are red vein-looking things on the outer skin. The original part (last year's keiki) has no red on the leaves, but the cane is getting a reddish purple color. Not any noticeable pattern to it--mostly the top segment, and some streaking down from that. I hadn't read anything about canes getting those colors. Is that normal? Or is it getting too much sun? It is right next to the other NOID Den.