I've never used the waterfalls because they have to be cleaned so often and I like to keep things simple. I've used the foggers and they work nicely, but the area directly above the ultrasonic atomizer gets really hot. The fog itself isn't hot, but if you put your finger really close to the disc it will burn you. I had mine on a timer to go on for 15 minutes at a time, 3 times a day, and I used a screen drain net to cover it for the snake's protection.