Thanks for the replys and thoughts.
I elevated the smaller ones to get closer to the light as one PE monster in the bottom left was so tall compared to others. and in case some were cold although it is a carpeted floor.....
I have been careful not to overwater and i let the bags basically completely dry out before watering again. It was 1L every3-4 nights but they are drinking more now so I am going to go to 2L and no more. And will water based on needs and not schedule.
I think it is overfeeding as I have read autos are very sensitive and you need to do 1/4-1/2 what is recommended. I am doing all organic as I have just given teas a couple of times at 1/2 recommended dose. looks like this was even too much and will do 1/3 next time. I can see edges of leaves "burn" a bit so its why i think its that rather than overwatering..... but it is my first so Im taking everything into consideration.
Thanks again for the feedback and please dont hesitate to let me know if their is anything else I should be doing/trying.
Cheers
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