Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
Rams breed in the warmer (80*) water, but are OK in the mid-upper 70s. I do not know if they might not show their best breeding color in the cooler water, but they live just fine.
I would set up a separate tank for the Rams.
2 mated pair in a tank 3' long (for example a 40 gallon breeder) and add fish that are of a suitable size and water parameter preference. Cardinal, Bleeding Heart, or Rummy Nose Tetras and Hatchet fish come to mind, though there are a lot more. I would suggest nothing larger than about 3", and 2" schooling fish might be better.