Hello everyone this is day 18 of my first indoor g...

I'd say its safe to LST these young ladies based on what I see in your diary they could handle it and it will open up some more nodes to the light allowing for faster growth . I can see that on some of your leaves you have some browning and the very ends of your leaves are curling making a rake shape . These along with the dark green colour of your leaves leads me to believe that your facing a little bit of nitrogen toxicity . In order to correct this I would lower the amount of times you feed with nutrients and feed with ph corrected water in between nutrient feeding . Based on your grow stats its important to understand that soil as a medium can hold nutrients for a longer time because the roots wont be able to absorb all of it as it would say a hydroponics system . So when your feeding nutrients all the time your just stacking nutrients in the soil and this is what will cause the burns and locks outs . So if you feed your plant every 2-3 watering instead you can be assured that your roots will try to use up all the nutrients in the soil before adding new ones . I say use PH corrected water in between nutrient waterings so your plant doesnt go into shock from changing PH that may cause her to stop growing or cause a great deal of stress that isn't needed for a short time . Its best to have the PH of the water remain the same and that if you're going to change it , it needs to be done slowly . I hope this information helps you -Happy Growing!