Ok so I lied, I decided to water again tonight.
Fed them each 2L of RO water containing:
.5ml/L of Potassium Silicate
1.25ml/L of Cal Mag
1.5ml/L Part 1 Base Nutrient
1.5ml/L Part 2 Base Nutrient
1.25ml/L Root Builder
1.25ml/L Vitathrive
The ph was 5.7 , no ph down was required. Starting to...