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mine are at 25 and are doing fine.
They are a from cooler waters. You can keep them at these temperatures but they do better around 18-20. Nor are they S.American.
OP - Dwarf flag cichlid? Laetacara curviceps
As for an alternative to neons, what is it that is putting you off? Behaviour? Shape? You could go for a deeper bodied tetra instead. Maybe Back/Red Phantoms.