Does it only have to be one?
I use GH GMB at 800-1100ppm 2-2-2 untill week 4.
Then i start A+B connoisseur at 900ppm per week. Its strong. Depending on how fast the pots dries out, on a normal week i water twice both at 500ppm A+B to last 8 days. Sometimes i bloom with GMB and use about...