Of you are growing in coco and perlite only. First thing I see is it is too dry. You can not over water in coco by soaking the substrate daily. Which checking your run off ph is important. If ph is out of line then you will be in lock out. Coco requires heavy and regular irrigation with constant ph monitoring to grow them big. Cal mag is always required with coco involved. Happy to help more if this is your issue just pm me after selection answer 🤜🤛
Hello try to water correctly your plants then measure the ph of the drain when you water. Correct it if it needs to be. Then use calmag additive because in coco it is important. You can use epsom salt for that or liquid calmag. For a quicker effect spray calmag on your plant. Good luck. Bye