It is sudden changes in pH that cause more problems rather than "incorrect" pH. Many fish these days are captive bred and have no idea they are supposed to be living in a different pH! 8)
My Africans were all born and raised in 7.2pH as that was what the ChCh water was where the breeder lived. When I got them home they lived in 7.0 as that is what my tap water was. Again, they bred in this and seemed very happy.