for your first 1/4 strength feeding I would use 5 millilitres of Cal-Mag Plus, 3 millilitres of Pure Blend Pro Grow and 2.5 millilitres per gallon of Liquid Karma. for vegetative growth 18/6 18 hours of light and 6 hours of darkness produces the fastest growth rates. I read a thread where lighting schedule versus root length was tested and 16/8 produced the longest roots, 18/6 was not tested. I was made aware of a study where lighting schedule versus growth was tested and plants given at least 5.5 hours of darkness grew the most.