Tropicals & Tender Perennials: What's my problem?, 1 by Paintedlady

Paintedlady wrote:
Most of my Brugs are green and healthy looking, except a few that are staying a bit yellowish. Then there is Jean Pasko, she is not only insisting on being pale, but also is getting brown around the leaf edges.
The plants are under a Metal Halide lamp and they get Miracle grow every now and then.
Is Jean Pasco just harder to grow inside? Could the air be too dry? Or does it look like a deficiency?
Any suggestions would be appreciated.
Kerstin