Thanks, guys. I'm glad to know I'm not alone. It's funny, I've been posting on a cockatiel forum with plenty of nice people, but you guys are the ones who I'm telling all my worries to. You aren't bird people but you're bunny people and you're my people.
I've left Kieran and Teddy alone in the new brooder for the past 3 hours. The new one is better because it's a lot more humid inside (which is good for them) and I don't have to open it every 5 minutes to check the temperature. I can see the thermometer from the outside. That means the babies are getting more rest and darkness. I want to put them back in the nest box, but I'm waiting to find out if this will spread to Phoenix and Neeja. I'm iffy on Neeja's condition, but Phoenix seems okay and I don't want him to get infected and die also. I think Kieran and Neeja are reasonably comfortable in the new brooder. They aren't crying.
I got them out of the brooder about 10 minutes ago to check on them. There crops are not emptying and they're fuller than they should be based on how much they've been fed. Their crops are very watery. Poor Kieran's crop is so big and over stretched, but his body is shriveled
His body is actually dumping its fluids into his crop. When I had him out, he was flailing about and crying and trying to vomit. It is absolutely heart breaking. I put him back in the brooder and he quieted down after a couple of minutes.
I want to call the vet when they open at 8 and find out about euthanasia. I don't want him to suffer anymore. If it turns out it is safe to put him back in the nest box, I'll put him back so he can spend his last hours with his parents and siblings, then I'll bring him to be put to sleep. I think this is kinder than waiting for him to die in the nest box because it will be faster.
Teddy's crop isn't nearly as full and overstretched, but it's still full. He isn't looking dehydrated yet. When I took him out, he was crying in hunger. His crop is full (and I can see the muscles working), but it isn't emptying into his stomach very fast so he's hungry. I can't feed him when his crop is full of goo though, it will just back up and make him vomit and stretch out his crop. He isn't past hope yet and I'm willing to try emptying him again once I talk to the breeder contact (who is still asleep understandably since it's 4:15 in the morning there).