Black spots on fan leaves

New grower here … I’ve been running into a few spots on my upper fan leaves … I was open to get some expertise on what it could be ? Thanks in advance

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No idea what those black spots are. But pic 3 is a mag deficiency.

Pic 2 looks like early cal def, but the brown spots in 3 are also cal def.

IE: Add calmag to watering day (properly pH’d of course)

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