weird one here, I think that cal mag might help, look for bugs under the leaves and on the steam too, also it will be a week or so till you see results of calmag, since damage starts at the roots first then up, some healing might be happining already. its good that you have the hygrozyme, keep using that it will help thoughs roots. keep us posted, if you want to take care of any fungus sulfer is good and cheep, and should be used any way, at least once in the grow, if not a few times or even once a week or once a month, untill a week or 2 before bud start to show up.also foiler spraying some neem oil regularly might help next time, to keep from getting this, However it does look like a deficiancy, but only time will tell. hopefull that calmag will help,