I'm not adding any buffers (other than what's in salt mix) and my pH stays constant between water changes (slight dip after lights go out).
I do though aerate my change water (fr a home ro/di unit) for a day or two before adding salt.
Before I had the direct hookup I was also aerating the topoff water in gallon jugs before adding, now I'm straight from the ro/di unit through a float valve to sump and notice no difference in pH. Still believe though a good idea for larger volumes to aerate first.
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