Removed Universol Yellow from the nutrients.
Managed to get a hold on the ph trouble with keeping the nutrient temperature at 20°C and 1ml 11.9% H2O2 for each litre of nutrient solution.
Raised the EC to 1.6.
Ori is going strong, NL#2 is comming along aswell, NL#1 takes a little longer but is comming aswell.
Defoliated a lot again, removed all bigger fan leafes.
Did a full reservoir change and barely have to correct PH anymore, most likely it was a bad bacteria problem.