Another Klei Yokor based on Pirkei Avos כל מחלוקת לשם שמים סופו להתקיים says, the water above and below should be separated for the purpose of combining them to make shomayim. The purpose of separation should be unity.
The second day where the waters were separated has no ki tov whereas the first day separation there is. Why? I heard, to separate light and darkness is good but separating water and water, before combining them, is not.
