being one that battled mites, i think it may be a mite problem. Go to radio shack and get a handheld microscope. They cost about $15 and will help you greatly in seeing the trichs and looking for pests also.
I got the same one cheaper and better than the one I got at the hydrostore for the same price and less magnification power. BTW ur baby is coming along but I would say approximately 2 weeks till the karate chop.That is a very nice scope they sell i got one
good luck
ur plants look great