What’s wrong with my seedlings?

Top_Shelf_Indica

Active Member
I suspect it’s a ph problem but I don’t know all 3 are 3 weeks old the 1st was stalled for a week. Why don’t they all look like the 3rd pic at least it has many layers and mostly looks good but I don’t know why the leaves aren’t developing bigger right amount of nodes though 8th node smallest leaves
 

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