Rust spots on fan leaves

Hey everyone, all three of my 3 week old girls have these weird rust spots on the leaves that I haven’t a clue on what’s up with that. I’ve only given them calmag and ph’d water. Any help would be greatly appreciated!

I saw that on my crop too. Since I’m growing in a greenhouse/outdoors, I wrote it off as back splash from watering.
I would gently wipe if off save keep a close eye on it. It’s probably nothing.

I had the same thing on my autos, it morphed into all of the upper leaves dying back severely. I suspect over feeding not sure try to half my notes from recommendation, maybe a light issue my light isn’t the best. The plant is well into flower now and they seem to be doing alright. The lower leaves are fine, I’m like WTF, anyone have similar experience? Sorry I may have hijacked your thread.

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