It sounds like you're off to a good start. In my opinion, and this is just my opinion, and it may not be shared by other people on the board, you do not have to treat for Chytrid. Heres my reasoning. 1st, those frogs are captive bred, and although that certainly does not exempt them from Chytrid (it was first discovered in captive frogs) I would doubt that it is infected. 2nd, you don't have a large collection nor are you introducing this frog to any other frogs, so there is no risk of it infecting others. Those two facts in conjunction with the fact that treatment carries its own risks and can stress out a frog further would lead me to advise against treating it. Thats just my two cents, and i'm sure others will have differing opinions. In the end its up to you.

Best of Luck,
Alex