Anyone familiar with this?

Autopuff

Member
Hi all … long time watcher first time poster.
Plants start off well … I’m up to week 3 of Bruce banner autos grown in 70 coco 30 perlite. 250ppm … ive seen this before and things don’t turn out well.
See the dark centres and one of the fan leaves upcurling. Thought it might be a nitrogen deficiency but usually get dark green with that.
I helped a friend out in his room and think I brought whatever nasty he has back home.
‘The small ones are mine … and the larger plant is my mates
Any help would be greatly appreciated
 
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