ya i read alot of people use addivitives. I havent in my experiences but iam sure there is somthin to it . It seems everyone has ther own formula. And pending the strain all grows react differently. I would watch for deffishincies and try and diagnios and add addivitivies as needed. I hear alot of people use Cal Mag????there is plenty of additives u can give your plants stuff like enzymes or superthrive /big bud