If you want to coax your rams into breeding, provide them with soft water and increase the water temperature a bit, up to 28 °C (82 °F). The recommended pH range is 5.5 - 6.5. Use a timer for the aquarium lights, because erratic day and night patterns can confuse them and interfere with normal breeding behaviour. It is important to include flat stones in the aquarium set up. Some pairs prefer to dig small pits in the gravel and use as breeding sites instead or in combination with stones.
Hope that helped !!