We had a big avery when we were kids and we had mostly budgies, but also a few finches, canaries and peach-faces (love birds) and they were all in together. As far as I remember there was never a problem with them being in together.
yeh they will be fine. Just watch the budgies as they can be bullies. If you notice they are losing lots of feathers, seperate them as they are under stress.
I think I remember reading that curved beaked birds (like budgies and parrots) and flat beaked birds (like canaries and finches) shouldn't be housed together. Although, given enough space, I think canaries and budgies might be ok. Maybe just start out with a couple of each and have a back up plan in case they don't get along. For example, have someone that can take either the budgies or the canaries on standby.
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