From what I can gather, there are four pure freshwater species of archerfish (I think they are all Australian). There is a fifth that is commonly sold in pet stores as just an archerfish that is mostly freshwater, but can be found in slightly brackish waters. That fifth species is reportedly able to live its life in a pure freshwater habitat. There are only two species that are brackish and require it to survive. Or at least that is what I have read.
As for bio types, I don't mind mixing them. So long as all my fish get along without killing one another, I am happy with that. I do keep SA cichlids almost exclusively, but that is just because I have been drawn to them more than any other fish.
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