The borax is not a critical need at this time. If you plan on lowering the TA and need to raise pH quickly borax or washing soda (in the laundry aisle at the store, usually down low on the rack) will work. (you don't have to lower the TA if the pH is stable) Right now your pH is fine at 7.2. If you would like to raise it a little you can point the return up so the surface of the water churns and raise the pH by aeration.