DWC/Plant problems

whatsup everyone, so basically this is my first dwc grow. I can't tell if she's growing good or what cause she looks a little droopy, colors good though I think. Any thoughts? I have the bottom of the rock wool slightly in my oxygenated water and as you can see coated all around it with hydroton. Thanks for the responses! Also, should I begin to add nutes or should I wait a little longer. Don't want her to burn alive. Plan on using Lucas Formula.

 

That's not mold btw just cracked hydroton lol