My mother bred finches and canaries decades ago, so I'm not unfamiliar with small birds and their care. However I suspect some of that "knowledge" is rather dusty and uncertain, and some bits are sure to be obsolete. So I'll go down the list.
First, here are the birds:
CAGE:
The one I have:
http://www.petsmart.com/bird/cages-stan ... 3Dcategory
The one I want:
http://qualitycage.com/index.php?main_p ... ucts_id=72
I have a manzanita perch, a "fir" perch, an edible perch up high that they are completely ignoring and was probably intended for parakeets and/or cockatiels, a grape vine perch, and one of the standard dowel-type perches that came with the cage. The Grape vine perch is mounted in the front left corner; the fir perch is mounted at the back of the cage so it sticks out to just in front of the seed cup on the left side. The manzanita perch is currently mounted low on the right side, a bit back of center, and the "dowel" perch is mounted high in the cage just under the nest basket.
I am probably going to remove the dowel perch and put the manzanita perch up there instead. They just sit up as high as possible all the time anyway, which is probably sort of predictable given they've only been here for less than 24 hours and they still get all nervy when I come in the room.
I watched these guys for like 3 hours yesterday before purchasing. The PetSmart kids thought I was nuts. But I wanted to see how they all behaved together, especially given that the white one looks just ever so slightly raggedy.
At first I thought the light brown one was picking on the little white one, but as I watched I realized they are buds and they spent a fair amount of time preening each other. The other two society finches in the cage-quarium didn't really have much character. These 2 were much more interesting to watch.
So I have a cuttlefish thingy installed - and boy are those small and expensive these days! And I got a "Beak Buffer Beak Conditioning Stone" brand "All Living Things", which was stupid expensive, but they didn't have any mineral blocks. They haven't touched either one so far. We always kept both a cuttlefish and a mineral block in each cage and the birds would eventually use them both at various times. I assume these will do the same - eventually.
I picked up a bag of "All Living Things canary and Finch daily diet". All the bird seed they had in the store for caged finches seems to have dyed seed in it. Not my favorite thing, but apparently its not poisoning them in droves so I picked it up anyway.
For water I picked up an Insight "Clean Water Silo Waterer" - I can't tell for sure whether or not they are using it yet, but I have a bowl of water in the bottom of the cage just in case. Its currently mounted so that the part they drink out of is parallel to the upper dowel perch, a little less than 2" away. Should I mount that on the back so it sticks out perpendicular to the perch? Or move it closer to the perch but leave it parallel? They've got to be drinking water from somewhere or they'd be pushin' up daisies, to quote Monty Python in re birds (specifically parrots) whot are pinin' for the fjords.
THE GENDER ISSUE
So - given these are society finches - I have no idea whether I have girl(s) or boy(s). How-some-ever, the little white one sings along when I play this video of a young male Society finch singing (or trying to). He/she/it sounds just like that bird, and not like a cricket. What else do I need to look for to try to solve the gender identity crisis here at home?
OTHER STUFFS
So here are my other questions - most of these I'm getting mixed signals and conflicting information from various finch and vet sites:
1) pelleted feed - yea or nay? In combination with seeds, or just quit using the seed mixes?
2) hulled sunflower and nyjer which I feed to my wild birds - yea or nay for my caged birds, in small quantities, mixed with whatever else I am feeding them?
3) Cilantro - yea or nay?
4) Spinach - "not too often" I have read. How often is OK?
5) Frozen banana bits or other small fruit pieces (which are let to thaw first) - OK?
6) Sunflower leaves, if my wild birds don't get them all first - yea or nay?
7) Vitamin drops - yea or nay? If yea, is Oasis brand OK?

9) Speaking of things that are supposed to help wear down birdy nails - cement perches, "beach sand" perches, and "seashell" perches and all their ilk - yea or nay? If they work even a LITTLE bit, that would help me out, as I don't plan on trying to clip tiny birdy nails with my shiversome hands and lousy eyesight. It's really a 2 person job anyway. So anything that slows that down so I don't have to go pay as much as I paid for the birds to start with to have their nails done would be a good thing.
10) F.M. Brown's Cuttlebone Calcium Powder] ... PI6KMKIY4B - useful until I can get some oyster shell from the feed store? I wonder because it says "powdered".
11) Speaking of grit or gritty-like things - charcoal. Can I just use activated charcoal intended for aquariums? Crushed up that would be. If not, where can I get whatever I AM supposed to use?
12) Kaytee Pet Products Forti-Diet Pro Health Hi-Calcium Grit Small Bird Supplement - Useful?
So I have the seed cups that came with the cage, but the finch guys (or gals) are not using them. They are 2" deep - I'm wondering if that's too deep for little finchy guys. It is my habit (or was lo these 4 or 5 decades ago) to put a small amount of seed in the seed cups and refill as necessary during the day, because otherwise my finchly minions leave a layer of hulls on top of the rest of the seed, which is a pain to clear off. So I would put about what I estimated they could eat before giving up on any buried seed below that level, and then just dump the hulls and refill.
We also had much smaller seed cups, usually several per cage. So can they just not reach the seed down at the bottom of that 2" cup? They are eating the millet spray, so they're not starving - yet. I'm looking at replacing the ginormous seed cups that came with the cage with the old style egg cups and treat feeders like some of the ones on this page. The egg cups, the extra large treat cups, and the egg biscuit cups. Refilling is easier than blowing the hulls out. I'm thinking with only 2 birds I shouldn't need many and I shouldn't have to refill all that often.
Or maybe these would be better - though they are apparently 1.5" deep, is that possibly still to deep for my finchly minions? Have I another option?
And finally (for now, until I think of more stuff to question), way back when we had this small cage like thing that we hung off the front of the cage with both doors open. It was baited with goodies. When the birds fluttered in, you dropped the cage door on the trap cage and un-hung it from the main cage - voila, birds ready for transport!
I can't find anything like that for purchase. Its possible it was something my dad made - he did a lot of that kind of thing. Has anybody heard of or seen something like that?
Am I leaving anything out?