I need to raise my pH and TA a little bit:
pH is 7.4
TA is 50ppm
I am not clear on what I have in this bag labeled Sodium Hydrogen Carbonate
I think I answered my own question: on the other side of the brown bag which I hadn't looked at it also says: Alkalinity Increaser. There is a chart for how much to add to increase the alkalinity by 10ppm, 20ppm etc. I am pretty sure this is baking soda.
Just to be safe I am going to add half the recommended amount and measure later in the day