hey there , looks like a (rare) magnesium lock out, most people have the opposite problem but seems there has been a build up from using two souces and plenty of things to make it available. it's the worst possible time to disrupt the plant but you do need to flush : water until run off then water again with 30% of the initial plain water quantity to get a good amount of runoff then next watering cut back the nutrients quite a lot and hope for the best. Hope this helps ! 🚀