im in my second week of flower,and the leaves on some of my plants are still yellow with brown spots and look abit unhealthy and a few seem to be stunted in growth,i gave them some biogrow yesturday so they wont need feeding for a few days im thinking of spray feeding the leaves with epsom salts to see if tht will help them green up a bit ,they had some whilst ,in the veg stage around 4/5 weeks in ,they are starting to flower with a few white hairs developing will it harm them in any way if i spray feed them or not or should i wait till they need feeding again in the pot or should i not give them any at all please help