How long was it in the fridge?
Hooch is only formed after the exhaustion of feeding of the flour's sugars, when the culture is starting to slag--to go dormant. With some of my cultures, hooch will not form for almost two weeks, whereas some (more active) like the Carl's Orgeon trail will form hooch within a week or so. It really varies from culture to culture and on how thick or thin you are keeping your culture IMHE...