Thank's all, you right that is a water excess, earlier i have watered too soon to add first nutrients, but it's a mistake !
For the next grow, can i use Rhizoponics & Humic Fulvic in the very first watering ?
Cause in 1 week the soil don't dry because of roots absence, it's the second time i have the problem but i don't want to kill the plants while germinating with a overdose of roots booster