In this soilless environment I was a little bit late measuring cal-mag and add that stuff. I will try a mix of soil and soiless substrate next grow. I don't recommend soiless medium for beginners. Essentially to measure EC and PH I think. So I try a little bit soil in the next grow to avoid this stress 😜
My nuts were older than one year. Maybe they weren't good at all. Try the BioBizz stuff with new bottles next time.