You could get confirmation from a exotic veterinarian (or someone else who has found this effective) to go ahead and pick up Flagyl (Metronidazole) in the oral liquid form and treat your frog for an appetite problem. Don't do the multivitamin that much, more than enough will lead to toxicity quickly. Calcium w/ d3 you don't have to worry about as much - just check to see that your brand doesn't contain high amounts of d3 in it as that is not needed. Calcium is very hard to overdose if you follow a regime.

The temperature at night stays the same as the daytime, even after the daylight goes off and there's only night time viewing?