hi, shame you live so far away you would of been more than welcome to some zebs, as for keeping the owls with the zebra finches that would properly be o.k,owl finches are generally passive birds and come from the same country as zebs. they are quite differcult at times to breed from anyway from what i've read so breeding might not be so much of a problem . zebra finches on the other hand breed like rabbits !really it all depend on the size of the cage you have,and as a rule try to introduce the new birds to the cage at the same time. dont take anything i say as gosbel though as i am just a keeper with limited experience , maybe try a google search and see if you can find any other info and advice good luck whatever you decide to do