what bulbs are you running? they are under one ge 6500k and one blueplus
i almost think it is bleaching them with too much light, but they are growing well so i'm left not knowing if the clear skirts are good or bad.
My light setup from back to front.
Aquablue
Super Actinic
Aquasun
Blue Plus
Aquablue
I read somewhere that some SPS guys were testing out bulbs in 3900k - 4800k Kelvin area? I'm not sure if this is accurate or not but I'll see if I can dig up a link.