COCO you feed once or twice every day !!!!
Your plants are tiny so dont need much food yet
You should flush the coco ASAP with x3 the water the pot holds, x2 should be plain ph water @ 5.8 . The 3rd should be a weak nutrient solution @0.5ml per liter and ph 5.8 . I feel your plants may have "Lightened up" not due to a deficiency but more a lockouk due to too much of something
Do you have an EC meter ??
Once you have flushed you can just raise EC slowly to avoid future issues , I raise mine 0.2 at a time
You plants dont need anything thing like 3ml untill into flowering after the stretch IMHO
Lucky you are in coco so its nice and easy to fix issues
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