What do you mean? I thought anacondas were actually smaller then a ball python
In all seriousness though a lot of the above are great options. Dwarf locality boas, rainbow boas and carpet pythons are great suggestions. I'm iffy on a blood python (though I've never kept one) I wouldn't want you to end up with one of the odd nasty ones. I also really know nothing about Savu pythons so I can't comment on them.
Personally, I'd choose a rainbow boa because they are so gorgeous. Just make sure you can attain the humidity requirements
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