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I respect Aquas reply, but if you wanna change them around.
I use FloraMax A+B (they use 1 double pack for veg and bloom) so that saves you buying 2 sets of As and Bs.
The thing i loved most is the new pH buffering technology. With it, it allows me to use the additive range from Advanced Nutrients - used together they hold pH quite well without adjusting (7.0)
Testing first time and i can say my first 4 weeks (using FloraMax a+b and Tarantula Advanced Nute) was crazy, i look forward to seeing what the same bottles of A and B do in Bloom
So to clarify
FloraMax A+B (used for veg and bloom)
Advanced Nutrients - tarantula, rhino skin, candybud.
These 2 brands pH buffer each other which involves less mucking about
Im also trying CYCOs Ryzofuel for weeks 1-2 bloom - but don't like CYCOs range too much.