hi! ime, 2pairs for 55gs would be great for them even for life!
how long wud take them to breed it? ime, it would go for as short as 3days to one month
depending on the individual.
how often they will have babies? ime, every 2 weeks or so they will lay eggs again.
how many babies? well it will depends on the size of the female. of course large females will lay more eggs than the smaller. u can expect HUNDREDS of them.
what do i do on my fries? i keep em around, theyre so cute and it never ceases to amaze me how the parents take care of em. some hobbyists feed them to their monster fishes and some others sell them to their LFS. personally i wud go for the latter options.

and buy or trade fishfoods,equipments etc.
have fun with ur cons, theyre trully amazing fishes to have.