Help needed

Hey guys
This is my first grow in coco coir with a new set up I had some yellow leaves start last week so I started adding calmag but although they are growing madly I am worried there is still a underlying issue so I was hoping someone more experienced could offer advice my ladies are 26 days old I only have them in 3L pots so I believe they need reporting into bigger pots as got some roots reaching out the bottom of the plant pots would you agree?? Also do you all think they need more than root shoot grow A&B and calmag and how often should i add calmag? I am giving 18hour light 6 hours lights o
I look forward to you advise
Stay blessed
 

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