Welcome!
I'd check with the vet near you, it can be difficult to find a vet that will see rats (especially and do surgeries, which is important as there is a good chance you will need a surgery at some point, like a tumor removal or a spay/neuter), and even more difficult to find a GOOD one. It's also important to find an e-vet as well. Perhaps you already checked, but I just wanted to point it out, because I've seen so many people end up with sick rats and then find out the vet they have sucks/is incompetent, or they have an emergency and no 24 hour vet they can get to. Hopefully you can get that squared away.
Please don't think anyone is picking on you or anything. I honestly wish I had the information I received from forums before I got rats.