I don't have access to any other pictures right now, but the stems looked identical to the upshot photo at the top--with purple lines running through the stem and branches.
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I feel ya! I've been banging my head with this one for a while, but hopefully I'm closing in on the cause.
Slow growth, red stems and dead spots on the leaves (often start as a bright yellow mark on an otherwise dark green leaf). Affected both veg and flower plants, upper and lower leaves...