For the brevs, it always safest IMO to get the room humidity up or provide a good misting once or twice a day with a good dry out period in between mistings and at night. But if that's tricky then check out the articles below, to me plumbing a humidifier into the tank should be the last solution. I use to plumb all my tanks but when I switched apartments I had a room dedicated to pygmy chams and figured it was easier/less maintenance and safer to humidify the room instead.
Just be careful not to let the tank get too wet or you may chance a URI, eye infections, etc. – really avoid sustained humidity of 80 and above. Nothing wrong with hitting 75-80 on the gauge after a misting … I usually mist until I see the gauge hit 75 then stop.
Good airflow into the tank is important too ... I like a fan in the room that puts a subtle breeze into the tank.
-roo