Finally getting my first ball. Have a few questions.

[j_h_smith]

do i have to supplement his diet with calcium or a multivitamin or anything like I have to do with my beardie?

As long as the mouse/rat is healthy and has been given a proper diet, you will not need a suppliment. In 99.999999% of the time, you will not need a suppliment.

HTH,
Jim Smith