I could probably get away with 2, one in the morning and one at night but I don't like it sitting in the 60% percent range for 2 long. The amount of times you mist is really going to depend on what the air quality is like around were you live. If its really dry air you will have to mist and if theres lots of moisture in the air you will have to mist less. The way I solved the problem because it gets very dry here in the winter is a bought a humidifier for the frog room and this helps a lot. It actually has a sensor were you can set it at a desired humidity level and it kicks on if it goes lower then this number, I keep the room at 60%. If you need to go out of town you need have a friend watch them for you or you have to get a mister hooked up to a hygrotherm. For the tongue they are sometimes are very bad at catching food, try to tong feed him and see if he can get them and this way you may be able to see if his tongues extended out. They don't chase food very often unless they are very hungry, they are sit and wait predators.