Flush with a lot of pure water,this will clean up the soil it is in,when top of soil drys,transplant to larger pot, pour 1x4 tsp peters 20 20 20,with micro nuts to 1 gal water,,pour till runs out bottom of planter,this will clean the soil again,if plants are still a dark green,give one more flush with clean water,Use no more than 1x4tsp ferts: at anytime,during veg, plants can still get to much,if they get dark again,repeat....I Fert:with 1x4tsp every time i water till it runs out bottom,if they start getting dark i flush with rain water,and wait till they need water again to see if they need ferts:most of time takes two times to reduce dark color....