dude i had the same problem.cheap isnt always best.go to ur closest hydroponic store and get dnf gro.when u use stuff like u r using normally its to strong and lacks in a lot of fertz that u need.its not a lot like 20 bucks for 2 bottle and they will last for at least 2 crops.but im telling u that u need and flush ur plants befor using it.ur plants will grow faster and u will notice a huge change in ur leaves in about a week.try it u wont be dissappointed