A pair doesn't necessary mean a breeding pair or a compatible pair.
Whether you like it or not, it just meant a male and a female.
A confirmed breeding pair is a male and female that had bred before together successfully with frys being raised.
More then 95% of the time you can just put a male fighter and a female together and they will successfully breed.
The only thing you have to take into consideration is the size of the two fish.
The male have to be bigger then the female to succeed.
The female shouldn't be left till the tummy gets too big .
Do not bother them when you're trying to breed them.
hth,
ron