Blue Dream'Matic FastBuds

@Reefkeeper, thanks again. After correcting the PH, the ec can reach a total of around 2 meassured in the run off

@GreenamI, Good thinking on the lights. I would definitely dial them back. It may not be the only problem but it will help you eliminate one variable and will stress the plant less either way. Are you saying your PH adjustment takes your EC from 1.3 to 2 or adds around .2?

Heey @Reefkeeper, thanks for thinking along. I also figured it is probaly not a deficiency, since I mainted a propper EC and gave a bio calmag additive. Due to a nitrogen toxicity before, we unfortunately had to flush the plants a few weeks back. Now I have been feeding regularly in the soil indeed and measured the pH and EC, and we can't see anything abnormal, PH is stable around 6,3. The EC was often around 1.3 including the 0,2 from the tap water. Hower including ph+/- could raise the EC around 2. Do you reckon this could cause the lock out? I personally believe the most likely issue is the light intensity, the light is a big overkill for the size of the tent. I used a greenception gc 9, and the symptoms only appear in the top part from the plants and look very similar. In a previous run, I used less than half the watts and the results were stunning.

@Bouleuss, thanks bud! These are home made femenised auto's with silver colloid