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Is this a cal-mag issue or possibly light issues. Fastbuds 420 Northern Lights auto 23 days DWC under 300watt light at 50% 18" away General Hydro nutes, Lucas formula Temps 82 Humidity 40%-50% 40k Lux around top of plant 650 ppm

I'm having trouble with my first grow. 2 White Widow Autos, growing in soil Royal Gold Mendo Mix, 3x3 tent, 300w light, 80 temp, 61%humidity. Plants have been sprouting for 24 days and are not growing, bottom leaves are yellowing. I'm not using nutrients. Any ideas of what i can do to try to...