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In my opinion, if a species arrives without a collecting locality, then you should NEVER give it one. You could be wrong and could mess up someone's pure population by mixing.
I have to agree with Mike. C. regani populations are wide ranging and are not significantly different from each other to make a guess at location. I have had the Tapajos population before, but the pheotypic diversity within the group of twelve I started with (all wild) was broad. Occasionally a geographic population is so distinct that they can be easily differentiated, but those are often the most likely to be given species status eventually. The best example I can think of is Pelvicachromis taeniatus 'Wouri' which is distinct from all other P. taeniatus.
Hi Mike
As far as I know, parents of my fish (my are F1) were imported by Amazon-Exotic-Import, which co-operates with shop where I bought my C. regani pair. They (A-E-I) had wild Crenicichla regani 'Rio Negro' once. See this: http://goslinea.com/Gallerie/Zwergcichliden/Seiten/Crenicichla regani Rio Negro.htm
So have anyone an idea where they really came from???