Im pretty sure golden eye cichlids are Rams, and a 12gal might be a bit to small for 2 of these but i think 1 might be ok, i would just keep an eye on it just it case it gets to agressive.
Nannocara s are not rams but they are a type of dwarf cichlid more closely related to apistogramma if you get a male and 2 females you will find that the male will forever chase the females so you will need to supply lots of hiding places for the females. And if they start breeding you'll have to consider removing the other fish . Ideally though i think they need a more room then a 12 gallon. When were happiests when they were in a 3ft long tank!! But they are lovely fish with lots of character!!