Well, I took out a couple of the pots and the soil was dry as a desert! It just fell apart and crumbled with some clinching on to the roots. So it CANT be overwatering. I have never ever overwatered chills, only tomatoes and other stuff. I´m just too careful with the water and the chilies. I´m attacking it again. This time I took one row with epsom, seaweed and humus ferts. Watered properly and let it drain off. One row I moved outside of the tent to a cooler shelf with T5 lightning fixture. And one row is in the other part of the house with the tomatoes where its more humid. I also raised the light in the tents and mounted more fans. I just can't budge for overwatering when its Sahara in the pots!
Oh, almost forgot! The flushed plants seem to be adjusting it colors again and go darker. So that might be one cure, that it was too much ferts. Strange though, since I always use this mix..... However, I´ll keep you updated the next days and see whats happening. Where the leaves fell off there is new growth so I aint too worried...... yet