Further to my earlier post regarding whether I'm overwatering vs nitrogen toxicity I have a few photos showing the damaged new growth leaf tips and it includes the top shoot on one plant. I'm getting more worried as the day goes on and need to correct this issue. I'm not sure if it's N toxicity or overwatering and I really need to solve the problem before I gets worse. I've considered root rot as well but that's unlikely as it's more than one plant and in compost with good drainage. I think it's toxicity but I need a more experienced diagnosis, here are the pics of the affected new growth leaves.
I'm getting a little worried as it's very wide spread on one of the Master Kush and it's now not drinking as much water as it was. My money is on too much N but I'd love someone with more experience to confirm either way. I'm about to go to flower and need it solved ASAP. Thanks guys.