What’s wrong with my plants?

Could be overwatering. The last pic looks like a zinc deficiency.

 

a little humic /fulvic will help, you are drowning your roots mate , if you have spare soil from your bag left, take the same size pot and fill it with your soil mix / dry/ weight it / document weight / water it and drench it wet wet, let it drain about 30 min / weight it / take your dry weight and wet weight divide by half and when you get to that 40 percent weight , feed your plants , that is the best method until you get use to growing better .
once you have achieved that then you can learn the lean weight , by leaning your pot towards you, same thing wet and dry balance of the pots.
believe me when you adapt to this practice eventually your gonna get sick of doing it and by that time you will be able to tell just by looking at them as to when to feed/water
maybe this will help

 

Spots probably go away once th root zone is sorted out, right now there isnt any air in there from overwatering

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