Your math is good; 5.8ml is closer but 6.0 is close enough...enjoy the savings and don't add the activator.
I purchase 50% Biological Grade Glutaraldehyde and store it in the downstairs refrigerator; it substantially improves the shelf life.
75 Gallon, 2X55W AH Supply CF 8800K, 1XMarineland Doublebright, 2X Marineland 350 Magnum; 45 Gallon Tall, 96Watt AH Supply CF 6700K; 30 Gallon Long; Fluval F&P 2.0 36"/46W; 20 Gallon, 1X26W AH Supply LED kit; all with Press. CO2; (Calcined) Montmorillonite Clay
Greater Seattle Aquarium Society (GSAS)