What’s wrong with my seedlings?

[Top_Shelf_Indica]

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

 

[crimsonecho]

what is your medium?

 

[MickFoster]

They look fried and the soil looks nasty.

 

[blueberrymilkshake]

They look fried and the soil looks nasty.

Your mother was a hamster and your father smelled of elderberries!

 

[bk78]

You're mother was a hamster and your father smelled of elderberries!

Your*

 

[blueberrymilkshake]

Your*

Thanks