
Tin foil barbs are tropical fish and get too large, your best bet are sub-tropical species, Buenos Aires tetras would do well and are geographically correct, barbs that come from sub tropical areas like China, though not geographically correct, would work in the cooler temps gymnos like, Rosy barbs come to mind.
As far as Geos, any of the braziliensis complex can handle cooler temps, Geo iporangensis come to mind, although not sure if they would be too aggressive, or because of their similarity of looks, territorial issues may be a problem.
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