I have wicked hard water with a Ph of 8.6-8.8 out of the tap.
I just treat with prime and call it done, like Karma said.
I only have 2 RCS in the 5g along with a Ghost shrimp or two plus a couple guppies and snails. They have been in this tank for quite some time now with no ill effects. I don't buffer or treat anything, in my experience it isn't worth it to even try. All my tanks sit at 6.4-7.2 with ZERO actual buffering aside from plants and wood, if they even affect it - even though it's high 8's out of the tap. I over thought things for a while, now I just keep it simple.