Is this a nutrient deficiency or something else?

Realbax

Well-Known Member
Hi everyone. This round is in its 3rd week of vegetation. I transplanted these into their final 5 gallon smart pots last week. I had been spraying a light nute mix for a few days at the end of the second week. After transplanting I stopped spraying and started a light nute mix into the water for normal feeding. Of the seven strains I'm trying this round this issue has only shown up on this one plant. The plant strain is tutankhamun from pyramid seeds. As you can see from the picture, it looks like rusting but it came on in 24hrs and all have been getting the same regime.
 

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