Yes, I usually give them just water. Cha-Ching once a week, 3 gallons spread around 15 plants, then 2 gallons regular water. Molasses water once a week, same 3 gallons, 2 gallons reg water. Regular watering (a little bit) usually daily. I stab my finger down into the soil like a high school boy with his first gf. If the soil is moist I let them dry out some more. Everything has been going well, until today. I am starting to think it is a reaction to the extreme temperature change. Lights on, 80 degrees, 35% RH, light out 65 degrees, 45% RH. No power all day Wednesday, 41 degrees, 70% RH. I read the extreme temp swing and cold can block Phosphorus consumption.