Unless you're keeping very delicate fish, like discus or rams, or wild caught fish, you don't need to worry about your ph. Trying to change it to suit your fish just leads to varying pH levels which are far worse for fish than keeping it stable.
'Buffer's' are basically minerals that keep the hardness up and stop the pH crashing, you can't buffer down!
Non of the fish you're thinking of keeping need anything special done with regards to pH at all. The eventual level in your tank will probably end up slightly less than what comes out of your tap (as fish and plants use up minerals and produce nitrate which slightly acidify the water), but that's honestly nothing to worry about.
I think many beginners worry far too much about pH; in the normal run of things you can more or less forget about it.
I've had play sand in four of my tanks for nearly two years and have never had any trouble with sand compacting, or turning anaerobic or anything like that!
'Buffer's' are basically minerals that keep the hardness up and stop the pH crashing, you can't buffer down!
Non of the fish you're thinking of keeping need anything special done with regards to pH at all. The eventual level in your tank will probably end up slightly less than what comes out of your tap (as fish and plants use up minerals and produce nitrate which slightly acidify the water), but that's honestly nothing to worry about.
I think many beginners worry far too much about pH; in the normal run of things you can more or less forget about it.
I've had play sand in four of my tanks for nearly two years and have never had any trouble with sand compacting, or turning anaerobic or anything like that!