Some plants turning lime green

Lime green primarily on newer growth with green still down the midribs gives you a choice of iron, manganese or alkaline oH skew. DO NOT add more organic nitrogen 2-3 weeks into flower that's not going to help anyrhing. Magnesium. Does cause interveinal chlorosis but it's more older growth one would expect given magnesiums mobility. Near impossible to give you a precise answer given how little of a diary you have. Could be a skew from incorrect fertilizer, over or underwatering, if you have been feeding any sugars that could be immobimizing nitrogen. I notice watering hoses all over the floor how do you even water your plants? If you are watering with auto watering system is the timing setup parralell with equal watering in each pots. Without a clear and concise diary you are just leaving it open to a best guess. Check pH, nothing matters without your pH. Adding more nutrients (salts) to a locked-out medium only makes the problem worse. Instead of helping the plant, you are simply increasing the salt concentration, which can lead to other issues.

It is just a little N defiency. Feed them a little more! They are hungry!

They look pretty healthy. I would say they just need an increase of nutrients, I don't see/think anything major issue to worry about

Hi just had a look over your diary from what I can see in the pic is the colour of them in the 1st week some being really dark green which is saying nitrogen overload causing block out that's why they now turned light green in your last week, there limited info to give accurate advice but if you know you gave to much nitrogen in veg you would know and then if you havnt been giving nitrogen at a high amount then I think you need to add some but not too much she wants p/k now nitrogen can stall this, they will recover, other than the colour there sound..

Looks like a mild nitrogen or magnesium deficiency, brother. Around week 4 of flower, they still need a bit of N to keep that healthy green tone. You did well adding Epsom and CalMag I’d just bump N slightly next feed (something like Grow 1ml/L or a light veg mix). Keep your pH tight around 6.2 and they’ll darken back up in days.