IMO, they don't need misting. The water in the tank provides enough humidity to the "microclimate" of the enclosure. However depending on the live plants you may have, it might benefit the plants. You don't have to get overly worried about the chorine and chloramines in the tap water. I used tap water for five or six months with my first fbt before I found out there was some risk. However he never showed any adverse affects and three years later is still well and the most active. I now use distilled water which is cheap and easy to find. Less trouble than having to dechlorinate and buy more chemicals. It also doesn't leave spots on the side of the glass if left to dry.