Anything is possible but thats A LOT! Funny story I thought my girls were drinking 6 - 10 gallons of water per 4 or 5 days and then I found out I had a leak. It was facing my wall and I couldnt see it plus I have a custom over flow tray that is like 3 feet by 12 feet so 6 gallons spread out over that doesnt look like that much water. If I were you I would check for leaks, check to see if your buckets are filling with water and not draining, check the dryness of your room, I'm in AZ and water doesnt stand a chance, it evaporates quick. I'll post a pic of my ladies for you to get a gauge and they def dont drink 8 gallons a day (i also have 12 girls) whats up with the #12 you in AZ to?