Ok so for two months now I've been battling this ri that is affecting my ball pythons I've taken them to the vet gotten cultures and now I'm used 3 antibiotics with these things first it was baytril, trimethel sulfate, then gentimycin. All of which tested positive on killing this thing but is not working on my babies. So I'll give you guys a little more info and see if anyone has any advice so they are all kept on aspen that is changed twice weekly they are kept in a rack made of PVC and in sterilite tubs the tubs and rack are disinfected twice weekly with chlorhexidine temps are mid 90s water is changed daily dishes are cleaned with chlorhexidine twice weekly humidity is around the 50% range. Any help would be great the vet wants me to use a 4th antibiotic and I didn't even want to use 3 I cannot remember the name of bacterial ri they have but any ideas please