hey ara, apparently melbas are particularly insectivorous.
i have only had my birds for a year now, and whilst i'd love to say that i've raised some chicks - i haven't. but its largely my fault. their daily staple is a very good mix of various seeds and lebanese cucumber. they show no interest in fruit, grated carrot or lettuce. they just must have their lebanese cucumber though! the cordons and saints love eating the heads off mealworms, but thats it so i rarely feed them. there would be a significant amount of bugs caught in the aviary though, its heavily planted and i have noticed whenever i water the plants the birds get excited and start hopping around in the mulch - its hard to see what they are doing but i'm pretty sure they are catching the tiny bugs that come up with the moisture. i suspect waxbills really need smaller bugs, like maggots, fruitflies and termites and i just can't deliver those things on a daily basis.
when i first got my orange breasts and fires, they nested and bred like crazy - but i was losing all the chicks. i was very busy with work and couldn't really keep a steady stream of insects. so i tried a bit of packaged softfood mix - but the birds didn't seem to show any interest in it. they continued to want to breed again and again and eventually i removed all the nesting material over winter to allow them a rest (and to save me the task of removing dead chicks from the aviary floor)
spring came arrived with glorious warm weather and i prematurely reinstated nesting materials - and lost my tamest finch - an orangebreast hen, to egg binding with a cold snap.
so far i've seen very little breeding behaviour however a number of newer birds have gone in the mix and my ratios are hardly ideal. my fires are the only birds in neat pairs of 3.3 (although i suspect one pair have never bonded). i also have a spare cock OB now, although the males don't actually fight and i think they are about to nest again.
i also have pushy bachelor pairs of saints and cordons, which probably don't help and effectively strawberries as well as my only hen arrived mostly flightless and the two boys show little interest in her (she hops around on the floor by day but manages to climb up to roost)
so basically its not a great scenario in there, but after many these and many. many other mistakes made. i'm just glad i have a stable group of birds that have been with me awhile. i have lost a number of hens of different species - virtually all have been new aquisitions that have died from stress or were already sick etc.
and i'm not even going to mention the tri coloured parrotfinches!
BUT - like i said - i am new to it all and i started to think that its okay if i don't breed everything. waxbills really only need food to feed their young. the adults are healthy on the easily acquired food (i occasionally give greed seed too). they live for quite a few years too so its not like you don't get your moneys worth.
still, i'm about to get some more birds. the odd waxbill hen again to even things up and i'm thinking about some cubans (for song, like the strawbs) and having a crack at some various parrotfinches. from what i've read they don't need live food at all.
still - i can't stress how much i adore my waxbills!