Keep them in a species only tank. They are extremely good parenting fish and will actually look after other fishes fry for them!
They are highly aggressive though when spawning and will fry around, so are best kept alone.
They do well on most high quality flake food but will require a treat of brine / mysis shrimp occasionally.
They are extremely beautiful fish and good on you for taking them. Just bare in mind though your tank is NOT big enough to attempt to keep anything else with them, if these are a breeding pair, it will be WW3 with anything else in that tank.
Best of luck with them