Cal-Mag for sure. You need a good veg NPK. Sense your using ffof, use Fox Farm nute line. Hear is a link to the two products you need + Cal-Mag. http://foxfarmfertilizer.com/products_liqfert1.htmlHello guys & gals,can anybody tell me whats wrong and what can i do to fix this plant please ? day 49 of veg,no nutes yet,ffof soil,400w mh,2 feet tall