What size tank do you have?
In a large enough tank, I see no problems, I used to have 3 GBR's (2m, 1f) and 2 Bolivs (m) in a 62g tank with no problems at all, youd get the odd chase if one intruded on the others territory, but nothing serious, saying that I never had a breeding pair so maybe this would cause a problem, but I doubt it.
Also what else have you in your tank with the rams?