great setup and the plants are looking good 
I think you maybe overfeeding slightly as your EC is quite high; burnt tips of leaves and rusty burnt spots.
sorry what would you recommend and I’m using this scheduleHey there
On GH's feed chart for the Flora Series they have 3 different rates of feed-
Aggressive
Medium
Light
At an EC of 2.3 you seem to be following the aggressive feed schedule for the time of growth.
This may also be locking out mag- fade between leaf veins, notorious Def in Coco.
I hope this is helpful much love
Sorry also
sorry what would you recommend and I’m using this schedule
are you using all 6 bottles? Especially the calimagic? And how often do you water? I would be using the medium feed schedule, I imagine the light is mainly for long flowering sativas. In Coco in a flood and drain I usually stick around 1.3/1.4 in veg with up to 4 floods a day and notch up as they transition into flower anywhere up to 2.0 depending on strain. 
they look super healthy 
Man those look great.Growing 2 fem black widow seeds. Using coco-perlite. 3x3x6 grow tent AC led lights 18-6 going to change schedule to 12/12 on Thursday which makes 5 weeks with ac vent setup. On week 5 using GH Flora Series. PH 5.8, ppm 1050-1150, EC 2.2-2.3 Trying to keep temp under 73 and humidity 60. I’m concern with the some burn marks on some leaves do they look norma. These pic were taken today any advice is greatly appreciate.
