rift cichlids aka mumba fish will love the high ph and harder water tho i would go for those personally if you dont have access to a good supply of RO water to keep marines.
DG
OMG that is a much better name than Mbuna
You can keep most fish in that ph, I have ph of about 8.2, and keep neons, angelfish, gouramis, pleco, zebra danios
and have kept before, mollies, platy, guppy, tiger barbs, kissing gourami, khuli loaches, convict cichlids,
and there is loads more that I can keep in my water, its the more sensitve fish, like discus and marine, fw rays