Chlorine or nut burn ?

Hi ! Yesterday I've forgot to dechlorinate my water and to save the reservoir added dechlorinator after around half an hour . Would that cause those burns ? Or is it a nutrients burn ? My ppm stands 420 , tap water 088 ( last few days prior to that solution was a bit too strong (630ppm) would that still show up today or is that from chlorine in fresh solution ? , I do have a problem with root rot as well .does anyone using gse (grapefruit seed extract ), what's the dosage (it's in oil form ) ? My main question is why does leafs looks burned ? Any tips how to fight root rot , (dont want to use h2o2 ). Any advice highly appreciated ,
 

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