@GrowerNL, Sorry, I just noticed your message. I use GH Flora Trio set and CalMag. I’m using the schedule on the site Coco For Cannabis. The solutions end up with high EC, so they have to be diluted. I made the mistake of diluting with plain water instead of the recommended water and CalMag solution, which I believe caused a deficiency in magnesium. My mistake has been corrected and the plants are looking great. No new yellowing. Thanks and sorry for the late reply.
Hello and welcome to the community.. Hope you are well and u enjoy being part of a great network of people.. Stay safe n gud luck with all ur gardening adventures.. 👍🍀