keeping bantams?

hi there im 20 years old and hav recently built myself an avairy that houses 5 bengalese finches 4 zebra finches 15 fife canaries a rosella and 1 quail. the dimensions of my aviary are--(flight) 8foot by 3 foot---(shed)6 foot by 8 foot. my gran kept bantams wen i was younger and i was wondering if i could maybe keep a couple in my avairy. any information on this would b much appreciated as im trying to learn things quickly. thanks