The advice given in this thread is correct. I'm on my first plant, first weak attempt at a grow while we finish our real room for the real grow. So this is my trial run if you will. I found this exact advice out on my own. I grow our 1 plant currently in a ghetto macguyver'd UPS wardrobe box with mylar, humidifier, fan, digi thermometer with hygrometer and 6 CFL bulbs.
Using fox farms ocean forest in a 3 gal smart pot. My baby is about 5.5 weeks old, hasn't shown sex just yet, getting close though, and still vegging strongly under 18/6 lighting.
My watering schedule is as follows:
Water approx 2x/week. Water in bathtub until a decent amount of runoff. pH the runoff just for info. Completely saturate the pot when you do this.
Normally for the first watering, I use about a gallon of RO water with added nutes, and am going to start using 1.5 gallons soon as this last watering I wish I used the entire gallon and wished I had made 2 gallons of the nute solution as I wanted more runoff. I use fox farms big bloom, grow big, grow-tek Pro-Silicate, and Cal-Mag. I've been slowly ramping the baby up on my nutes, increasing the PPM's slightly each time. Currently running at 50% nutes.
This is the first watering. Then I wait. I wait several days, I let it dry out..I "finger check" the soil in about 3 days and monitor daily after that to see when to water my second watering of the week. Usually its about 4 days in between.
My second watering I give plain RO water with only cal-mag and molasses, no other nutes. Again, put plant in bathtub, saturate soil, measure runoff. Put plant back into wardrobe box, leave until dry and repeat the cycle going back to the nute watering next.