Bunterbiber

@allways_beginner, yes, I observe these parameters except ppm.

@allways_beginner, yes I know this page and I already worked myself through. The situation with the hanging leafs improved already...I just put them on the window where they now get direct sunlight. It seems that now they need more than just the blue spectrum of the LED light.

@allways_beginner, since this is my first grow and I'd like to test topping for now and I don't have to get everything out of the plants.

@allways_beginner, exactly...I know that I only need a little bit, but it's relatively cheap and it's what I need. I don't have to get everything out of the plants. If I get 50g out of the plants in good quality I'm happy....and I think this shouldn't be a problem if nothing dramatic happens.