Plants were growing at a slow rate until they stopped and start to droop, I've tried underwatering and watering normal, like 200ml each when dry soil. Also tried 500ml when dry soil.
temp is 24-26 celsius, humidity was around 50%, today I cooled to 24c and woke uup with 21% humdity(I hanged a wet towel and humidity is rising), I believe the problem is my relative humidty, but not sure, because they were drooping at 50-55% already (and two plants are afghan which I believe they should be more resistat to low humidity). Soil is foxfarm, water Ph 6, ppm 50, 2x1000d spiderfarm, 18/4, no light leaks, a fan down and an exhaust on top cloudnine
Stop measuring your water and get that soil WET, from top to bottom, side to side. Put them in a dish or shallow plastic container and water until it comes out the bottom and the sides of the cloth pot are wet.
THEN don't water again for a few days, until the pots are light, but not as light as they are right now.
I believe you guys are right, I lifted the pots and they were very light and dry, I now completely watered them, put a plastic bag on pot and wait. thanks! I've grown big and nice outdoor plants before, I thought indoor was easy, couldn't be more wrong