White Widow day 42 looks like she lacks something

Thanks for you answers :) Sorry, I was limited in characters in my first post :-D Thanks for the watering advice. I water them only when the pots weight is half the amount then right after watering. I water until it starts to rinse out into the tray. I had to leave my plants alone for this week. So on Monday evening I filled the bottom tray with one or two cm of water. She looked definitely healthier on Monday. Considering the weight and the first few cm of soil she doesn't seem to be overwatered. I also have quite a problem with fungus gnats since approx two weeks. So I already mounted yellow sticky traps and filled up the pot with sand. I ordered nematodes this week and added them into the water today. EC of my watering showed me 235 ppm. pH was 6.4. When I measured the run off water it showed me 340 ppm and 6.7 pH. I am changing into the first week of flower today. Thanks for your input. I will keep you up to date. If I get enough free time I will start a diary also ;) @Fusion: When the leaves start darkening after the addition of fresh lemon juice... What indicates this? My humidity is around 40%. I had the problem when I set up an humidifier in my flat and put it to 60% all my room plants began to mould on top of the soil. So I never turned the humidifier on again^^ That was a few weeks before I got the seeds for my lady.

Could be heat stress or over watering. Let your medium dry on top. Heat just keep it around 26-28c , humidity 60-65%. Add few drops of fresh lemon juice to your solution and see if your leaves start darkening. Will notice right away.

hi dude, the info you provide is not sufficient. The plant is stressed! If you want to have your issue diagnosed and sorted, will need more info: ph and EC of the run off water at the bottom of the tray. what watering habits do you practice? Looks like nutrient lockdown and due to this, deficits are starting to form. When watering - water only when the pot feels light or the soil is dry! when watering, do it until you get some run off water in the bottom tray. If not, all the salts will be kept near the roots and this will lock them. Best of luck with your grow. Start documenting a diary, will be easier to understand what is happening with the plant.