pH sometimes needs to be lowered in tanks with coral (calcite) or arragonite substrate. Practice does not always follow theory.
As for baking soda, I tried this approach in a simple glass of fresh RO water. I could not raise the pH at all. The pH was sitting somewhere below 7, and I could not get it up no matter how much I put in. However, when I tested the alkalinity, it was through the roof. I have also read another person's post regarding similar results using one of those "instant 8.2" products, which is apparently a pH buffer of some sort.
It may work for you, but it didn't for me. If you try it, just try it on a sample of tank water first.
Cheers,
kris