thanks pete. that clear up a lil on "toping off" but still confused a bit..according what latewood was saying, he changed nutes every week..let say every sunday..so, on sunday he would add liquid karma into the reserivor. right? if so how long does it take before he change the nutes in the reservor for the following flowering week...since he said he topping off between nutes change...i guess im confused with "between" nutes change...sorry i'm just trying to get the info. right before i get my hand on it...thanks