I'm currently treating my BP for a RI (when I got him a month ago, he was already sick) with Fortaz. The vet told me to give him a shot every three days for three weeks. Does this sound correct? His symptoms are very mild; the only thing I've ever noticed is a slight clicking/popping noise when he breathes sometimes. His breathing also seems to be somewhat fast and shallow (which is something the vet commented on). Could a RI cause this? Do RI infections usually return even if they've been treated with antibiotics?

He shed about a week ago; it was a bad shed, and I had to help him out (soaked him and then used a towel to help remove the shed). Since then, I've noticed that some of the lighter-colored scales on his back are now a purple/blue color. The scales themselves look fine. The vet noticed it during the exam and didn't seem to know what it might be; she said to just keep an eye on it, but it may actually just be his normal coloration. If anyone has any idea what could cause such a thing, please let me know, as I'm rather concerned. This is my first snake, and I'm already stressing over the fact that he has a RI.