NEASEMOanswered grow question 5 years ago I run Advanced Nutrients Grow/Micro/Bloom during veg and use their Connoisseur line for flower along with Bud Candy, Big Bud, and Overdrive. You can also run Lucas formula with the Micro and Bloom only, though I haven't tried that yet. As far as "mandatory" nutrients? I would say definitely grab some cal mag to go along with your base nutrients, especially if you plan on growing in coco, which I highly recommend. Supplements aren't necessary, but they help. As far as seed companies go, I've only dealt with attitude seed bank so far but I haven't been disappointed. Good luck and I hope this helped.