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Neither cal or mag? only water?

Theyve got 23 days till the sprouted out. the cotileidons have turned yellow/brown and died. Dont know what to do..

Please need some help !

Hey all, ive got now 5 autos going on, but 2 of them have a problem, they are growing so slow, the top leaves are yellowing between veins and theyve got burned some leaves. Water them with cal-mag till 0,3 Ec and Bio Grow till 0,5 EC - PH 6.1, im groing in biobizz light mix soil, 250w. Need some...