In need of some serious help asap

what's up guys need a little help
Am I under feeding ?

Day 19
5xAutos
Royal dwarf 275ppms 5.9 ph (bottom right)
Freeze berry 340ppms 6.0ph (top middle )
Big bomb 311ppms 6.0ph (top left)
Pyriimids purple 301 5.9ph (bottom left)
Blue desiel 324 5.9 ph (top right )

Roots are nice and white slightly stained from GH nutes great root growth



Temps
Res 68
Tent 74 Rh 44

4x4 tent
440cfm exhaust
240cfm intake

What's going on
I have some spots on the two bottom ones witch are royal dwarf and the purple

I am not a hydro grower but can tell ya those leaves on all my organic soil grows always do the same thing they die off with time. let them wilt and then remove them new growth looks awesome.