Lemon pie

Well they have just exploded with growth over this last week even #3 which suprised me thought i well and truly screwed that girl up buh shes just took it in her stride made me curious as to how she would take an actual topping (i may try her with it in future) and sure enough they are all showing signs of flower looking forward to seeing what these girls look like properly. So far i am well impressed with fastbuds genetics i know these lemon pie are good for beginners but jesus these girls just take what ever you throw at them fingers crossed that the rest of the grow continues this way Got a single little brown spot on 1 middle aged fan leaf it showed up over night not sure what it is im thinking cal/mag deficiency or excess any help would be much appreciated