I'm not sure what is happening...they don't look ill, except for now. I fed them yesterday they were all doing great. I got up at 5 am and one had died, an hour later, a second and now my husband says a third one is going. They are on game starter, not medicated though like I used for my chicks. They are under a heat lamp and in my living room so no cold drafts. What can I do? Thank you!