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Hence the use of two separate element symbols, Ca and Mg. They're paired because they fundamentally complement one another, both being alkaline earth metals and functioning as electrolytes.

I see you listed a Ca/Mg supplement, but this does look similar to a Calcium deficiency. Cal/Mag deficiencies are usually caused by pH fluctuations, as rollangrow said, it looks like a pH problem. However, the pH could be fine even with a deficiency. Do you have a soil pH meter? They're pretty...

Obviously they both contribute.

Looks like a potassium deficiency

Of course it would. A flowering light schedule from germination stunts growth. Besides, who said it was one thing?

Are you giving a photoperiod seedling 12/12?