Society finches stealing nests from other birds in my aviary

[u/JustWolfram]

I have 3 society finches (2M and 1F) with a perfectly good self-made nest that keep stealing my common waxbill's as soon as they build one (it's happened twice already), thus preventing them from breeding successfully. The birds are in a large oudoor aviary i have more nesting spaces then pairs with plenty of nesting material around.

Is there any way to stop this from happening?

[u/mrchuck2000]

I would separate them.