help! late flower going downhill fast

[bandit60001]

https://www.icmag.com/ic/album.php?albumid=66749&pictureid=1586106

https://www.icmag.com/ic/album.php?albumid=66749&pictureid=1586105
https://www.icmag.com/ic/album.php?albumid=66749&pictureid=1586103

76 degrees 60% rh
Hydro f&d fed with gh using lucas ratio
Ec 1.2-1.5 ph mid 5s to 6
All plants are showing varying degrees of what looks to be the same problem and are shedding leaves fast.
I just cant seem to figure it out by looking through the sick plant guides
Anyone care to offer their opinion?

 

[lysergicCO]

You probably already know you have mites.. Flushed them recently?