it's OK G. English is my primary language and I'm not so good with it sometimes...lol and ultrasonic fogger is a small device that sits just below the water line and create a fog with a small, vibrating disc. it excites the water molecules and creates a fog, which in turn, creates humidity. the key to them is placement. I always hide them in some sort of container so the frogs are protected by them. I only use them for effect. a misting or rain system will create more humidity in the tank.in my mantella tank, the humidity only goes up about 2% if I run the fogger constantly.





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