Check out Mammoth P. Its one of the last things to get when EVERUTHING else is good and right. In the right hands, it will up your yields by 20% or more. Check out Growmau5 YouTube channel Mammoth P run of Ocean grown seeds. He pulled 1.5 gpw off Cree CXA3070 Cobs. 4x10 room with a 4x10 cob array at 1530w. Incredible results....And its not half as expensive as it seems. He grew 14 huge plants and only used like half a bottle. Canna Coco A+B as well for killer stuff.