The most important thing is to start off with a little gas to put them to sleep first, then flood the chamber to kill them. if they are awake when you flood the chamber with gas it won't be painless.
I ended up just feeding it to them and watching very closely, imma get some dry ice and use a bucket to do it and see about doing like 10 and freezing them
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Ball Python
0.2 Normals (Coilette and Mary Jane)
1.0 Spider (Zues)
1.0 Pastel (De Sol)
Boa Constrictors
0.1 Brazilian Rainbow Boa (Stella)
0.1 BCI Hog Island (Kiyoko) 0.1 Dumerils Boa (Gloria) 1.1 Yellow Anaconda (Serenity and Diablo) 0.1 Albino Common Northern Boa BCI (Pandora)