They are shaking in tray. The bulb is only 7w not warm enough for them
it would be too drafty in bird cage for them .
just wish I had got everything in before theyhatched
Do you have a hot water bottle you could fill with hot water as a heat source? Or a heating pad? Or any other light bulb you could put in the lamp?
I read some where you can put the in a bowl with i lid and place a little cup in side with white vinger and bakeing soda it make a like gas chamber and they go quick the book is called Permaculture Chicken: Incubation Hand Book I got it on Kindle. Iam going to try to post a picture so you read it maybe off your computer. Here it is I hope it helps and Sorry that you have to do it.
Just for future information, while this will kill a chick, it's not a pleasant way to go. This kills them via suffocation with CO2. CO2 is the driving force behind breathing. If you hold your breath for awhile and then feel that overwhelming sense of needing to breathe, that's not because your body wants oxygen, it's because it's trying to expel the CO2 buildup.
So a chick killed in this way will feel like it's suffocating (because it is). It will be aware it's suffocating. It's not a nice way to go

https://healthfully.com/stages-death-carbon-dioxide-8696252.html
https://www.livescience.com/5910-carbon-dioxide-triggers-primordial-fear-suffocation.html
A similar, better way to cull a chick is to use ether, which you can easily find in the form of starting fluid. Ether used to be used as an anesthetic in surgery for both humans and animals. It simply puts the birds to sleep, and then they die peacefully.