Hi, I'm thinking about buying a humidifier, but it's ultrasonic (http://www.boneco.com/ats/en/products/class4_2.php?id=26). I remember from a book about gerbils that they talk ultrasonic. The machine and the gerbils will not be in the same room, not even in on the same floor. Has anybody have any experience with this? Can there be a problem / will there be a problem or is this harmless?
Thanx, Patrick PS. In relation to a question I asked here in june ... the ladies are doing fine, loving their home and not byting me anymore ;-))
