please help plants gettin worse

i have three plants that i thought had a slight nutrient burn from me making a newbie mistake by foliar feeding with the light on, i have rusty brown spots that spreading all over my plants they are in a dwc system rubbermaid tub:-(
 
their isnt anything you can do now. dont foliar feed is the moral of the story. lol. did you remember to spray the leaves off an hr or so after the feeding with straight ph'd water?
 
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