Betsy - I lost one the first night and none of them showed any signs of distress the evening before. It is sad, but it just happens sometimes. As long as everyone else seems active and alert, I wouldn't worry too much. I always raised the feeder to about chest height so they didn't lay down or sit to eat.
They are going to outgrow the rubber tub fast! The second day I had mine, I tried to put them all back in the shipping box so I could clean out the brooder. They wouldn't fit! Just the day before there was plenty of room in the box for all of them. You will be surprised how fast the food starts going, too! The first day I think they ate about 1/2 cup total between all of them and drank a 32 ounce bottle of water. Yesterday at just over three weeks old, they ate probably 20 cups of food and drank 4 gallons of water! I don't even want to think about how much they will be eating in a couple more weeks!
Yes, I've read their chow hounds! I can't get them to eat out of the feeder yet (circular with holes) but they're eating from a flat plate. And of course, just sitting down and eating. They're just 3 days old; I'll give them some grace and let them eat that way for now and work on training them to the feeders.