Hello Cashmere,
I would like to here some answers on this too!
I've had my 2 gliders for 7 months now. I feed them BML with fruits and vege in the BML list.
I notice that one of my gliders, she's brownish some weeks, some weeks more grey. I don't do anything differently, that I can think of.
Cashmere, can you share picture of your gliders if you don't mind? would like to see if our brownish is similar.