Made a big error in not pHing the tap water I was giving to the plants. I assumed it was fine but when the plants started showing signs of nute burn and lockout in Biobizz LightMix, I tested and realised it was pH 7.8 😫. Repotted into 5L pots this week and have watered with pH 5.5 to bring the soil to 6.8. Will lower again slightly next time I water. They do seem to have recovered though.