Nutrient Problem

Hey there GardeningDoug, sorry to say but you have a magnesium lockout, you can tell because you're seeing magnesium deficiency which is when the serrated edges of the leaves start to yellow but you're also adding a lot of calmag. Probably you're watering the plants with the same solution and not taking the time to mix it, the order in which you feed might have this plant simply recieve a bit more calmag than the rest over time this adds up and you can get a lock out. Try resetting the soil by watering carefully and evenly until the moment you're seeing runoff, measure how much water that was then add 20% more to get run off. that's a flush , then just start your exact same feeding regimen after 10 days, just be a bit more careful this time. Hope this helps ! 🚀