Calcium Spots Under LED

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Small rusty spots on the first true leaves of seedlings under LED, especially in coco or peat, are an early calcium shortage rather than a pest or a burn. Modern LEDs run cooler and plants drink less, which changes how much calcium moves through them compared with the old HPS days. When to add a light dose of calcium and magnesium, and how to tell those spots apart from septoria or mite damage, is illustrated on https://kushindicaseeds.com with close up photos. Fix it early because the damaged leaves never recover.