I read somewhere along the way that ultrasonic devices like pest control devices that you plug in are bad for hammies. I was wondering if anyone else has ever heard of that? I am getting a humidifier for my very small place and it has the ultrasonic feature in it and I am worried that it is not good for a hammie and their nervous system. Maybe it wasn’t ultrasonic at all that I read about, maybe something else similar or maybe I am just imagining it. The unit is supposed to be safe around animals but hammies are different. So am I imagining it or is it true?