Hello. I also own 2 zebra finches, I posted on your other post about zebras too. I think that you should separate them until they are old enough to have babies. Zebras breed very quickly. If they ever do lay eggs, do not pick them up with your hands, becuase my female zebra finch attacks and cracks open her eggs whenever someone touches them. Separate them until they are old enough to have babies, and when they do hatch keep the father in the cage becuase he is a great help with the babies (he even lays on the eggs) but do not make the mother have too many batches of eggs becuase it can be bad for her to lay on all those eggs and may cause her to die.