What to do with a lot of eggs
If a nest is full of eggs (I'd say more than 6 - although zebra finches can
successfully hatch 7 or 8 chicks in a clutch), I would recommend discarding the eggs.
Chances are that none of the eggs will get enough heat to develop fully. If you have more
zebra finches, you could of course always redistribute the eggs among the different nests,
but I would only recommend that to someone breeding for a specific purpose (other than
just seeing how the chicks develop).
You are welcome to ask again: