Hi,

the temperature is good, it should be between 25-28 Celcius,
that is 77-82,4 Fahrenheit i believe.

Humidity is somewhat low, it should be somewhere around 70%.
Altough they might withstand lower humidity levels as well.

Frogs in nature have breeding periods in wich they are more active,
they certainly call more during this periods.
Outside this periods they will be croaking less then when they feel like breeding.
That may be the problem, but looking at those values nothing is realy wrong with it.

If they don't eat for a night it is not that big of a deal,
but keep an eye on him.
If he doesn't get more active by raisin the levels you can let some fresh feces examine on any problems.
Altough i didn't hear you mentioning he is sitting in the water or anything,
my first guess would be that he got his resting period due to lower temps or humidity then usual.