Please help with spotted leaves

Nikkow2000

Member
Hi guys, I switched from soil to soilless and now I have these spots in every plant even my new seedlings on the leaves. Anyone know what it is? I am not using nutrients and my soil is hp herb and garden with an added 25% rice hulls and 25% coco coir. Plants are outside now but were under 18hr light. Any help appreciated.
 

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