hi Teresa,
I use the small bark from b&q, ( the big bark is too chunky and not as nice for them to dig through) I keep the spare in a old dustbin and change the base about 3 times a year. Don't forget to put a small wooden base around the edge as when they dig they will pile it all up and it falls through the mesh.
When I set up my aviary I got 2 males and 3 females all within a week of each other, also the same age and they all got on fine, not long after I accidentally stood on dash one of the males and he died, that is why i section of the bark so the floor is clean and flat where i walk in to feed them etc. So snowey was left with 3 females and when it came to season time, boy did he have his work cut out!
they all had litters, with babies being born days or a week apart and they kept them all in the same house, only the first litter from one of the mums, caused me to worry as she tried to move them. And only twice did i see that the mums ate a baby, i never saw the dad do it, But when they had the babies they made him leave the nest, I guess not enough room for 3 females and the babies, at one time I had 7 babies.
You should always have more females than males, and you have to think of what you will do with the babies, so as Tarcus says 2 females and 1 male would be a good choice. Addlington will get females in but from selling my babies they are always desperate for females, also they sell females as a pair so they don't fight. Also try to get the male from a different family as I was told they shouldn't interbreed, but maybe some one else could let me know also as knowing if they come form a different family is always a worry, which makes it difficult to get them at the same time.
Fingers crossed we both hear good news soon.
Sarah