A 10g is too small for a pair of rams, whether they are German Blues or Bolivians. GBR's should only be added to a mature tank that is about 6 months old. All rams are sensitive to nitrates so large weekly water changes need to be done to keep water pristine.
In a 10g you could do a pair of the smaller Apisto's such as Apistogramma agassizii. They are very small so would be suitable for that size tank. Also you could do up to 6 Scarlet Badis and Red Cherry Shrimp or any of the nano fish like Endlers, Ember Tetras, Dwarf or Pygmy Cory's and several other species.