my ph out of the tap is around 7.6 and I keep africans that generally do better in a higher ph range.
I've found over the years that the fish actually will acclimate to a ph that isn't the same as to what the ph was in the lakes that they are from because my fish are not wild caught. They are farm raised.
With this said the most important thing is to have a consistant ph range. I wouldn't buffer that ph unless my fish were WC.
I'm not a SA or CA expert, but I know they generally strive in the lower ph ranges. 6 may be a little low for them, but not much.
If their colors are good, I'd leave it, or you will have to buffer all the time and it wasn't worth the hassle to me because my fish all have good color and are breeding.