How does one go about filing a motion to reconsider in a CA superior court child custody case?

At a trial setting conference my ex began making allegations in court. Nothing was ever served regarding the allegations nor did he file anything in court. He just started blurting out alegations which, if given the opportunity I could prove untrue. At first the judge told him she couldn't do anything since a third party involved in the allegations wasn't even present and the allegations weren't the issue before the court. He persisted and she gave in and made a ruling. I had no chance to answer to the allegations nor opportunity to present evidence on my behalf. I believe her order violated my rights to due process. I would like to make a motion to reconsider and have the judge removed from the case. Is this possible?