hi im looking to build an avery and would like a mixed avery if poss the indoors part will be 7ft wide 8ft long 10ft high outside part 12ft square what could i keep with cockatiels thanks rob

I've seen cockatiels living happily with finches and budgies...I've also seen finches with their feet torn off by them.
It's all down to the temperament of the birds.Personally I wouldn't mix them with anything smaller.

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I personally would not put anything smaller than a budgie with cockatiels. I have both and they get on fine.
I would love a couple of rosellas but they are expensive but ive been told they can live with them.
I have rabbits at the bottom of the aviary and have a pond with a waterfall that the birds can paddle in.

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Grandma to Jinja Dog, Mum to Tilly the Cavalier, Tattycat, Moomy, Choo, Sonic, Niven Mc Twisp and Lawna the rabbits and 1 guinea,17 budgies, 4 Cockatiels, 8 Goldfish.

I agree with poohdog. Other small parrots will live happily with them. (Not lovebirds as they can be aggressive to other species).

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Not everything that goes up comes back down. Your age for example.
My pets (sorry I can't upload any pics yet)
Cats
Candy (12) Neo and Simba (10) Del Boy (7))
Cockatiels
Undertaker (My OH's choice)(10) Souxsie(10) Sid(9) Rimmer and LIster(1) Ruhbarb and Custard(hatched july 2010)
Rats
Frosty and Jack(1)
Gerbil
Pepper(almost6) Pepper sadly no longer with us RIP pepper.
Its almost a zoo at home,but we love them all.

thanks guys might get some rosellas as iv had these before maybe put them in first
i use to keep birds a few year ago here's what i had

pair of rosellas
pair of blue crowned conures
pair of love birds
pair of hahns macaws
pair of orange winged amazons
8 pairs of cockatiels
20 pairs of budgies

they all had there own aviarys but moved house and only had small garden so they had to go now im moving and the new place has a huge garden so starting up again can't wait to get it going
thanks again Rob