Just started my first DWC

I Need Some Help, I got a clone in the DWC and ive put the water level 2 right where the beginning roots are so the roots are being bubbled on, i moved the water level down and my plants got a lil burned, so i put the water level back 2 normal. Ive noticed my play looks a little yellowish too almost sickly, the ph levels of my tank are good. Any suggestions?

Possibly too many nutes?

Have you added nutes?

You gotta pic?