Are pre-mixed, or nutrient lines such as 'Nectar For the Gods' worth the cost? I'm looking to save some money for my grow, but not at the expense of quality. I'm generally the type of person who would rather piece together ingredients separately instead of buying something ready-to-go off the shelf. Also, I'm worried that like most products, they have the incentive to recommend more than you need. Am I better off buying nutrients in their raw form, and mixing them myself? Thank you for any insight and information.