The best thing to do would be to keep them in separate cages. I have Cockatiels as well and so far I haven't seen a single egg from them. Mind you, I do not know which gender is which with them, but separate cages is the best solution I can give if you want to be full proof. I am not sure if they are like hens where having eggs at regular intervals is simply part of their period.
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hahaha
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