im not tryin to argue im trying to help. if im wrong im wrong. wouldnt be the 1st time. what makes u think its a def? what nutrient def causes leaf fringes to curl up? the leaves are green all the way thru. theres in not 1 def that causes these symptoms. if there is i would like to know. I have personally dealt with this same issue. and it was humudity. when leaf fringes curl its related to water or humidity.
Im with you on the no argue bit , only i had this issue myself and the problem was Ph to high ,
a bit ago i changed medium from soil to hydro rockwool , needed my ph at 5.8 and it was 7.something due to a broken ph stick/metre ,
i had the curl and the wispy growth that looked just like that ,
problem is for example , some symptoms show the same def, ie high ph and a Boron def will show the same symptoms ,
i could go on , Peace umbre,
again i agee we are here to help the op