Im positive they are G.B.R.'s. Bolivian rams just dont have the color. They are also built differently. Bolivians are most robust, odd looking. G.B.R.'s look more delicate. Plus the difference in color. Very nice female G.B.R. you have there!
Whats the ph of the tank? I recently of a breeder for rams and cockatoo's adn he said they need a very low ph. He told me if i was seriously tihnking about it to collect rainwater, and filter it through with carbon, and add it to the tank for w/c.