I have read that some people like to flush every 7 days or so and i want to know how necessary it is? i have 2 week old plants in veg right now and am wondering if when i start giving nutes if i should flush weekly? i have a gallon of clearex i can use. if i should be flushing, what is the best way to go about doing it and for how long? i also use ro water. any help is appreciated and +rep. thanks.