Baking soda is used for raising KH which in turn stabalizes PH...true, but commonly
people add 1/4 tsp to the tank(for a smaller size tank) till the KH is where they want it.
But on that PH thing...each type of fish likes it a bit different from other types.
So just not putting in one that has "far left" requirements from the other fish is usually
all that's required. AND ...most pet shops just use de-chlorinated tap from the aria so
any fish you get from there is likely adjusted to that PH. If you live near there it may
be the same water source. I'd check this out because if it's the same water and you
change your tank PH any noticeable amount you may be doing more harm than good.
For most type fish that just giving them a hard time, not a disaster category issue.
Rams and a couple of others are an exception. South American is usually lower PH.
That tall of a tank will need a bit higher amount of light to get to the bottom
effectively...any specific plans on that ? Curiosity mostly because that looks like a
fixture for a T8 bulb. Only very low light plants will be able to grow/w that.
At the top of the "Low Tech" section is a list of plants that will grow in low light.
That is not "very low light" and only some on there will live/w only one T8 bulb.