GUESS WHAT CURES ACID IN PONDS OR TANKS?

While you are correct you need to consider the whole water parameters situation.

What you are doing is increasing the hardness, and adding mineral salts that balance the acid that is causing the pH to drop.

Now if your water is very soft, then a small amount of acid will cause the pH to drop. This doesn't worry many fish, and a lot of "soft water" species are quite happy with a pH down around 6.0. Other fish DO prefer harder and higher pH water, and a bit of baking soda can be useful.

But don't use it as a band aid to cover a pH that's falling due to water pollution. Yes you can balance the pH, but you still have the acidic waste in there, which may affect your fish. In that case changing the water is a better option. Removes the waste AND moves the pH back to normal.

So it's not so much "Curing" acidic conditions. It's more adjusting the water hardness and pH. There may be a use for baking soda in certain situations, but you shouldn't just use it try and chase some

"perfect" pH. If you are going to play with your water parameters, make sure you understand exactly what you are doing, and why.

Ian