Few flowering issues

Unsinkableship420

Active Member
Hi guys so I've got 4 plants that have just finished week 3 of flower , I'm in 70/30 coco/perlite and feeding 3 times daily to 20%ish runoff every feed.
Using r/o water adding 0.2 ec cal/mag before nutes ect
Temps 21-27c with lights on and 55-60 RH. In a 5x5 tent with 2 v2 260w kits and a 320w xl kit.

The main problems I'm having are growth rates, build up /plants not feeding and some random rust looking spots on one plant.

Everything seems to have stalled/slowed right down and plants aren't feeding according to my runoff... Like I flushed them down to 0.3ec on Sunday morning and now Monday evening my runoff is matching what I'm putting in ,1.3ec @6.1ph, also noticed some spots on the top fan leaves of my blue cheese ... Pics attached.
I'm stumped , this all went brilliantly when I was running hps... Since swapping to LEDs I've had drama after drama. Some help would be greatly appreciated.
 

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