Is it time to add nutes? Transplanted from MG to FFOF.

Last week and one day a go, I transplanted my one and a half month old bag seed plant from MG Organic into FFOF. The reason for that is because my plant was not growing. After 8 days now, the plant added 2 inches to height! However, I see yellowing, curling up, and brown spots on tips! All are signs of NPK deficiency. Considering this plant was transplanted into new soil while well into vegetative growth and into a NPK-less soil (FFOF has no NPK ratio), should I buy nutes? Im trying to save the life of this plant. Btw, i am sure its not acidic water or over watering, because i watered it when dry made sure it was dry and the soil just sucks up the water quicker than ever with everyday i have to water cuz the soil dries to quick. Im thinking my baby has been starving? HELP!!! :/

FOR PICTURES, goto my other thread on the most recent page and i posted 5 pics of te current poor plant :/ https://www.rollitup.org/marijuana-plant-problems/637172-1-5mo-plant-looks-like-5.html