DIY Fogging System

Before You Start

Fogging systems are a lot of fun and really give a unique look to the vivarium. However they do not work to replace a true misting system. The water particle size produced by ultrasonic foggers is not large enough or in a sufficient abundance to properly moisten anything but the smallest of vivariums. As it may look like the humidity is increasing, the amount of water actually available to your plants, mosses, and animals is quite limited and often merely condenses on the glass. This method is presented to allow you to design a unique look and supplement to a misting system, but NOT to replace it. A fogger alone will not be enough. This especially includes the in tank submersible foggers.

You will be using PVC tubing and electrically-powered devices that use water. Use common sense.

                                             Materials Needed

Ultrasonic Air Humidifier (non-ultrasonic versions will not work)

1"-1.5" PVC tubing couplers

Plastic flexible tubing. ("Bilge Pump Tubing" at Home Depot)

Electronic Timer


Remove the plastic top fog directional piece from the ultrasonic humidifier. This usually takes only a little force to snap off.

Insert a 1.5" pvc tubing coupler. Then insert into this coupler a 1" pvc tubing coupler. This will then allow your flexible bilge pump tubing to connect to your humidifier.

Now wherever your tubing ends, out will stream a billowing fog that can quickly fill the volume of even the largest vivariums.


By planning ahead with your build, you can insert PVC tubing with holes drilled in it into your background. Then when connecting your fogger to this embedded piece,  fog will stream out of the holes/cracks of your background. It is a very unique look, especially if pumped out near the water level of your tank as the fog will roll and cover the water first.

Make sure there are no spots where your tube can slag and begin to collect water as this can fill up and plug your fog stream.

It is very important to use distilled or DeIonized water only in your fogger reservoir as tap or spring water will contain solutes that will adhere to your ultrasonic membrane and prevent it from working. If this happens consult the directions of the humidifier.

In tank submersible foggers can be fun if used right. They work best in distilled water as solutes build up on their ultrasonic vibrating membrane rapidly. If you do want to use one of these, consider having a small container inside your vivarium that separates water and soil from getting into it. This way you can add distilled water into it and extend the life of your fogger. Personally I don't use these anymore as they tend to cost more than a much larger DIY system and have a much shorter life.
1" pvc coupler inside 1.5" pvc coupler, covered in silicone sealant and put into the humidifier.
In-tank fogger.
Use only distilled water to avoid buildup on your membrane, resulting in less fog.