Well my girl will eat (when she's eating... brumation, semi- or otherwise sucks) anywhere from 3-5 large nymphs at a time. She's about the same age as yours, so that puts it at maybe 35-40 a week. Given that adult females will give birth to about 30 at a time in ideal conditions... once every 2 months. That puts you at maybe needing a birth rate of 120 per month, so really if you waited to feed until your first round o' babies was big enough to feed off then you would probably be ok with maybe 10 adult females to start, but then again... the more the merrier since circumstances are never ideal. After all... your dragon might have an appetite larger than mine. I have about 80 adult females... and seeing as my girl will not be eating much for a few months... I expect that number to climb dramatically.