12-16-2009, 04:59 PM
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FP's suggestons are rift lake cichlids from Africa, so that is one option. If you are thinking more of South American dwarfs, yes, there are some that will manage fine with slightly basic (al;kaline) conditions. The cousin of the common ram is one, Mikrogeophagus altispinosus, common name Bolivian Ram. It has been caught in water with a pH around 7.6 and moderate hardness as well as in soft acidic water--in different areas mind, I'm not suggesting a particular fish can go from one extreme to another.
There are also several Apistogramma species that occur in slightly basic water. I researched a list in an earlier thread for someone, I can't find it now.