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They were sold as A. cf. eunotus spaltenfleck and they're wild souche(?)
I think it did not and after my research i was thinked at A. cf. eunotus huallaga (View my post in id).
OK, that makes sense. When people mention "A. cf. eunotus" (and nothing else), I usually think they mean the common Orangeschwanz/Orange-tail form. Obviously this isn't Orangeschwanz. It is one of the many forms of the eunotus-complex that have a spot pattern in the male's caudal fin. There are about a half-dozen different forms/populations with this feature. They could be Spaltenfleck, but I don't see the horizontally split caudal spot. They may be too young to see the feature right now. If they were sold as Spaltenfleck/Split-blotch, I doubt that they are wild fish. Commercial exporters don't uses this name, only breeders.
Sorry for my bad english, i'll try to be more accurate.
I don't know how "individual wild-type strain" is said in english.
In french we say "souche sauvage" for fish naturals forms (f1,f2,f3,etc...).
I believe that you mean, that they are F1 offspring from wild parents. If the father of your fish shows a split caudal spot, then they are A. cf. eunotus Spaltenfleck. If the fish were sold to you as "Spaltenfleck", then it is most likely that they are Spaltenfleck - unless they have different features.