1. Chelsea and her partner Alyson took care of a Medaka fish egg named Goliath, changing its water daily and keeping it at room temperature. 2. Goliath hatched on the seventh day and swam around quickly in the dish. 3. Over seven days, Chelsea and Alyson observed Goliath's development from embryo to hatchling, recording its heart rate and matching its stages of development to illustrations in their textbook.