I'm running 20/4 now and they are happier 24 hrs started causing deficiencies from constant growth. Being new I would stay with the 20/4. You are in good shape get your heat up and maintain constant humidity 55-68%
65 should be your off and 77 should be on. Just don't go above 80 or below 60 and you will be good. The plants will show purples from cold stress and burning and drooping from heat stress
Please message me I can help get you on track. You are just struggling with ph like most new growers do. The small plant probably just too longer to sprout. Treat them like pets not property you will get better end result if you love and nurture them to full maturation. Humidity is gonna be hard...
Check your pH you want yellow with a hint of orange. 5.8. Your plants are clawing from ph nutrient lockout
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Tap water has calcium and magnesium. If you want to use tap water prefill a reservoir with your water and a air pump the does atleast 2gal a minute or about 8l per minute. This will maximize oxigen in water and also gas off any harmful chlorines.
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Don't need Cal mag with soil that age it's 100%ph issue. Try switch to 5gal filtered water usually cost 0.25-0.35$per gallon.
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