I've never kept just a pair , I heard males will bully females to death .
I have a colony , 12 or so now , I started with 6 .
Badis species can be very similar to many cichlids in general as well as breeding behavior .
what size is your tank ? I would try getting a group , more females than males would nice , but good luck .
I have in my tank many types of hiding places from small 1.5" flower pots , coconut shell halves to rocks ,slate , many live plants to form shelter , as the saying goes , the more places you give them to hide , the more you'll probably see them , I do .
breeding : the male pics the spot , then he gets a female to join him , breeding is not out in the open , badis are cave spawner's , I had one make a spot under a large piece of shale .
the males take care of the eggs , and then newly hatched fry .
raising fry would be easier in an established tank , simply because the fry will find small critters to eat in suck a tank . newly hatched brine shrimp is said to be one of the easiest foods to offer fry , I've not yet used them . A spawn can yield over 60 fry , though as time passes the number will most likely drop .
back to adults , never had a problem with any of mine going after anything other than another badis , I keep them in a 70 gal with apistos , checker board cichlids both peacock and goo oboo gudgeons as well as cherry barbs , rasbora, and small rainbow fish ...........and something I forgot ...........my badis spawned in this tank , and the majority of what I have made it to adulthood , think of how many I could have if I removed the pair for breeding .
adding salt to water should avoided with badis , the don't handle it well , other wise ph around 7 , regular water changes , good food and you're fine ......food : mine have never eaten flake or pellet , don't think any will , mine will eat freeze dried foods ; blood worms , brine shrimps crushed krill and daphnia , frozen foods ;brine shrimp and blood worms , and live brine shrimp , I've never offered any small live insect larva , would if I could find a safe / reliable source . I'm sure they'd eat live black worms too , but I never feed them to any of my fish anymore .
Hope that helps , feel free to pm me with any questions