all right, it seems someone done their reseach! good job! and beautiful frog you got here! your qs have been covered already,
-use ca with vit 3, but 3 times a week, do it every other feeding and once a week multivitamins, because i tend to forget things, i do same days, i have Mon/Wed/Fri for ca/vit d3, Tues/Thurs/Sat- nothing, Sun- multivitamins. it is easier to remember when you do it on a same days every week. every day is too much.
- tank itself is too big, but he seems to have no problems feeding, I'd not push it though, at least place another plant on the other side to make him feel safer. what size is it now? I'm guessing about 2.5"? yes it is juvenile.
- get hydrotherm plug your fogger and heat lamp into it and live worry free about temps or humidity, that thing will control it for you, providing night temp drop as well.
- lazy frogs usually do better with tong feeding or so not to offend frogs, let's say frogs who are not too good at catching food, usually learn very fast that tongs are the best thing humans invented.
for the future when you clean after you use wipe off, you need to rinse it as well.

great start so far!