why are you fertilizing with happy frog (fox farm dirt) as that has plenty of nutes in it already? you have burnt the crap outta them. flush a bunch of water through them give them a little more pot. and use nothing but water from now on. been seeing alot of problems with FF dirt latley. my partner has used it for the last 5 years. but the last two grows been haveing problems the dirt get so hard its like plaster went back to sunshine #4 and not one problem