What type of medium; soil or hydro? soil What brand and type of soil? FFOF Indoors or outdoors? indoor What strain? Green Crack S1 Fem How old are the plants? 2 weeks What type of lights and how many watts? CFL How far from the lights? 6 in What is your watering frequency and source of water? every couple days What, how much and when was it fed? NPK? as needed small amounts of water What is the medium/runoff pH and PPM if in hydro? distilled water 7.0ph.. no runoff What are the temps and humidity in the room? 79deg 50% What size pots? Dixie cups Any bugs? Look real close. Knats but have been killed with mosiquto dunks Any other pertinent info? n/a
Many growers use Seedling mix...just to avoid moments like this, nute burn small but painful, flush with 3 times the volume of the pot, with Ph neutral air temperate water, monitor, no food for 2 weeks or until you see an improvement