The only reason I still have him on weaned rats is because I don't have a scale right now to know his exact weight. I know he's right around 600g but I'd rather be 100% sure before I bump him up to small rats. The smalls from the breeder are a pretty good size and I'm a worry-wart.
Should I bump him up to smalls anyway? I can grab one from the local petstore for his next feeding...