Brown Spots-Nebula from Seed

I have these brown spots at the tops of the hairs.....calcium/phosphorus deficiency..overwatering or mold-Thanks

Fox Farm Ocean and Srawberry mix
Feed twice a week Botanicare Base/Bloom Molasses
Folia Spray Apple Cider Vinegar/Hydrogen Peroxide(3%)
Epson Salt/Bonemeal every other on soil surface
15gl fabric pot ~4.5ft tall
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