White specs..not mites.HELP!

So i have some babys goin, all about 10ins...iv had them indoor for a few weeks (from clone). On the lower leafs there are white specs, the tops are lush and healthy. Definetly not mites, so im unsure what the issue is. I would post pics but i dont have a high def camera. any ideas? like i said the newer growth is healthy and these specks are only on the lower levels. humidity at around 60%, which im purposly keeping high...dont think its mold/mildew..thanks any help would be great!
 
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