Hey!
I checkout your diary.
Your plants have gotten really yellow from last week to this one.
Looks like a clear nutrient deficieny, i'd say it's phosphorus. that the P in the NPK basic nutrientes.
Leaves yellowing and those rusty spots showing up..
I advise you but the amount of PK your giving them.
PH, temp and humidity look good. maybe you could raise PH to 6.2 for better nutrient absorbtion.
Hope this helped.
Good luck and happy growing!