They might be male and female...tho I doubt you can tell at that size as they aren't mature enough...but they def are not a pair at that size and will not be spawning any time soon.
As far as feeding
blood worms
krill
shrimp
shrimp pellets
brine shrimp
any cichlid foods
earthworms
spinach (cooked lightly,frozen variety or canned)
peas
green beans