First place I would start is with the ph. It is way too high for hydro!

Another grower on here (oldmac) likes to keep his aero water at around 5.5ph.
I grow in dwc and keep it in between 5.6-5.8.

Get your ph fixed and check it twice daily at first to see how stable it is.
Give this about a week and you should see some change. :thumbsup: