i was wondering if on the canna web site when you use the grow guide it says tank size, is that the size of your pots or the size of the bucket (tank) of water your mixing?
I mix 12 gallons, in a 18 gallon tote with a couple airstones, water till gone - about 4 or 5 days, then repeat.
I'll add my water, type in 12 gallons & the rest, then add the amounts given. Let the solution mix then PH & use.
I only used a & b nutes with some great results!