Warum wächst die eine pflanze so gut? und die anderen nicht, die wahr vorher auch im zelt und sah genau so aus.

Hey, how's it going? Sounds like the room is in the basement. I would put a Styrofoam board or a wooden board under the black tub in the tent so that the plants aren't directly on the cold tiles. The tiles will definitely be a bit colder at those temperatures. I try to keep the temperatures around 25°C during the day and not below 18°C at night if possible. When it comes to watering, I've had good experiences watering every 2-3 days with 10-15% of the pot volume. If you don't have runoff every time, I would rule out overwatering. What week are the plants in and how much light are they getting at what distance? You can use the app "Photone" to get a somewhat decent ppfd value. For photoperiod plants in the growth phase, the ladies need a maximum of 300-400 ppfd. For the first 10-13 days of 12/12, the ladies should get 500 ppfd, and from day 14 of 12/12, the ladies should get 800+ ppfd. Sanlight has some reports on their site with various experiments. https://www.sanlight.com/news/maximaler-ertrag-evo-serie/ You can measure more precisely with PAR meters, but they cost a pretty penny. The distance to the LED should be around 40cm for Sanlight. Another possibility is that there might be a bit too little airflow. The fan should be positioned so that the air keeps moving in a way that the leaves of the plant are gently swaying in the breeze. It could also be that the ladies are slowly needing a bigger pot. I highly recommend fabric pots. Plants form a dense network of roots in fabric pots, are hard to overwater, and there’s better oxygen supply.