Do I need both argotect and tenacity flux to do my soldering?
You will only need to choose one or the other as they are both fluxes. The advantage of argotect is that it is usable with all grades of solder and helps to protect against fire stain (oxides raised in the metal when soldering). Both are used by mixing to a single cream consistency but tenacity flux can only be used with the higher temperature fluxes i.e.: medium and hard.