I usually go 1 tablespoon per gallon, but I don’t brew AACT anymore nearly as much as I used to in the past. The plant will make glucose all on its own, and give it back to the soil microbes via exudate excreted through the roots. I’d have to agree with @Papalag, less is more with molasses.
Purple petoles can be from intense lighting, genetics or signify a nutrient imbalance. Same thing with candy striping on the branches.