Advertisement Misting is just helpful for watering slings or tarantulas with lots of web that doesnt have a waterbowl. By misting yiu create waterdrops for them to drink. Misting does nothing to raise humidety in a tank. Cos the ammount of water that makes up for the misting can fit in a tablespoon! For raising humidety significally one has to pour water on the substrate! But the tank must be well ventilated, your is not! Avicularia is sensible for standing humid air. My suggestion is to get a tank that is appropriate for the speicies. Add around 5 inches of slightly mois substrate and lean some corcbark against the wall, or even better, a corkbark tube. Keep the substrate slightly moist by pouring some water on the sub now and then! Remember SLIGHTLY MOIST, not wet! GOOD LUCK AND WELCOME TO A NICE AND INTRESTING HOBBY!!