Medium looks dry. Are you feeding them looks hungry. Add Cal/Mag
It looks like coco to me. Should be wet at all times and not let it dry out. What nutrients are u using. I use jacks 321 and use it full strength from the start expand with it then 2 days of ro water after it sprouts then full strength from there on. Depending on nutes u use u should most likely be feeding atleast half to e/4 strength and water til u get about 20% runoff to avoid any buildups in the medium. Def looks like she needs some food for sure.
Oh pH set to 5.8 after u mix up nutes
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They look really hungry, lack of Nitrogen. Is that coco? I see a mulch covering? Regardless. Coco should be watered/fed daily and where you are in the growth stage to run off. PH is critical as Mark pointed out, could be the reason behind your leaf discoloration 
The soil under the top layer is still moist.
The mixture as per label on bottles per 1L
I use 250ml of emulsion to water all 4 plants !
Ph seems between 7-7.5
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Small fan blowing on them 10hours every second -3rd day
Oh boy.
Coco is gonna need a way lower PH - around 5.8. You may be feeding them plenty - I don’t honestly know. I’m not familiar with those nutes - but they aren’t going to be able to uptake those nutrients because the PH is too high.
I should also add that even for soil that PH is way too high. Soil is happy around 6.3-6.5.
As far as the pH tester - I highly recommend getting a PH pen - BlueLabs or Apera are my go-to recommendations for good quality testers. An Apera can be as cheap as $50 (compared to the $99 for a BlueLab pen it feels cheap anyway). What you’re using now is too broad of a range to be truly helpful for growing cannabis. I find that they are weirdly picky about their PH when you go with a soilless medium like coco.
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