Crested Gecko Humidity: How to Lower Humidity in a Tank

Crested geckos are originally from New Caledonia, a group of islands in the South Pacific where the climate is tropical. In their natural habitat, crested geckos are used to a high level of humidity.

The humidity plays a vital role in their health and well-being. For instance, it aids in their shedding process, helping them remove old skin effectively. It also influences their hydration and respiratory health.

However, they need a careful balance of humidity levels. Too little humidity can cause dehydration and incomplete shedding, also known as dysecdysis, while too much can lead to respiratory issues and promote fungal and bacterial growth in the tank.

Ideal Humidity Levels for Crested Geckos

Crested geckos thrive in environments with varying humidity levels throughout the day and night. To provide them with optimal conditions, it’s important to ensure humidity fluctuations that mimic their natural habitat.

According to expert guidelines and scientific research, crested geckos do best in high relative humidity (60–70%). During the daytime, aim to maintain humidity levels between 50% and 60%. However, during the nighttime when temperatures drop, increase to approximately 80% to replicate the tropical nighttime dew.

Remember that these recommended percentages serve as guidelines to help you create an ideal habitat for your gecko. Minor deviations from these ranges are generally not a cause for concern, as long as they do not occur frequently or persist for extended periods of time.

What Happens When Humidity is Too High in a Crested Gecko Tank?

When the humidity in a crested gecko’s tank is too high, it can create an environment conducive to the growth of harmful bacteria and fungi. You see, these little organisms thrive in damp, enclosed spaces – much like an overly humid terrarium.

In such conditions, your pet gecko can become susceptible to various infections and diseases, such as respiratory infections or skin conditions. And trust me, seeing your little friend in discomfort is the last thing you want!

Besides health issues, excessive humidity can also lead to an uncomfortable living environment for your gecko. Crested geckos, originating from New Caledonia, are accustomed to a certain level of humidity fluctuation in their natural habitat. They prefer a drop in humidity during the day and a spike at night. A constantly damp environment can be just as stressful for them as an overly dry one.

Signs of Excessive Humidity in a Crested Gecko Tank


Sign 1: Condensation in the Tank

Firstly, let’s talk about condensation. Imagine waking up on a chilly morning and seeing your window misted up – that’s condensation. If you’re seeing a similar scene inside your gecko’s tank, it’s a telltale sign of high humidity.

Sign 2: Appearance of Mold or Fungus

Then there’s the appearance of mold or fungus in the tank. Remember that one time when I was just starting with my first gecko, Sparky? Well, I noticed this odd patch of fuzzy white stuff on the bark of the climbing log. Turned out, it was fungus, a clear sign that Sparky’s tank was too humid.

Sign 3: Behavioral Changes in Your Gecko

Now, onto something a bit more subtle, but just as important: changes in your crested gecko’s behavior. If your usually active gecko has been lethargic or if you’ve noticed changes in their eating habits, it could be a sign of discomfort caused by excessive humidity.

Just last month, my gecko, Daisy, started refusing her favorite treat – mango puree. A check of the humidity levels in her tank revealed they were off the charts! Once I adjusted those, she was back to her cheerful, mango-loving self.

Sign 4: Rapid Breathing or ‘Gaping’

Another crucial sign to watch out for is rapid breathing or what we call ‘gaping’. It’s when your gecko keeps its mouth open, almost as if it’s panting. High humidity levels can affect their respiratory system, leading to this behavior.

Sign 5: Shedding Issues

And finally, let’s talk about shedding issues. Cresties shed their skin in one piece, unlike us humans. If you notice bits of skin sticking to your gecko, especially around their toes or tail, it might be a humidity problem. I once had to help my gecko, Rocky, with a difficult shed, and let me tell you, it wasn’t fun for either of us.

Methods to Lower Humidity in a Crested Gecko Tank

If the humidity in your crested gecko enclosure is more than the recommended ranges, you are going to start looking for ways to decrease it.

Here are a few things you can do to lower humidity in your crested gecko tank.

1. Improve Ventilation

First up, let’s talk about improving ventilation. Increased airflow can help reduce humidity, and it’s as simple as ensuring the tank has ample vents or even adding a fan.

I remember when I installed a small fan for my beloved crested gecko, Zippy. That little breeze maker made a huge difference in controlling humidity, and Zippy couldn’t have been happier!

2. Opt for a Less Water-Intensive Substrate

Next, consider the substrate you’re using. Some substrates retain more water than others, leading to higher humidity.

I learned this the hard way when I was using coconut fiber substrate, and the humidity levels were off the charts! Switching to a less water-intensive substrate, like paper towels or reptile carpet, made a world of difference.

3. Modify the Water Dish

Here’s a simple trick: modify the water dish. Using a smaller water dish or filling it less can help reduce humidity. It seems obvious now, but it was a game-changer for me when I first thought of it!

4. Use a Dehumidifier or Air Conditioner

Another effective method is using a dehumidifier or air conditioner in the room where you keep your tank. This can be a bit of an investment, but if you’re in a particularly humid climate, it could be worth every penny.

5. Control Room Humidity

Lastly, controlling the overall humidity in the room can help. This can be as simple as avoiding activities that generate steam or moisture, like cooking or showering, in the same room as your gecko’s tank. Trust me, your crested gecko will appreciate not living in a sauna!

6. Remove Live Plants 

Live plants seem to be the most natural habitat for your crested gecko but they can boost humidity levels and becomes dangerous for your gecko’s health.

To reduce humidity you should replace live plants with fake plants that are made up of plastic and easy to clean, such as Fluker’s Repta Vines-Pothos.

Use a Ceramic Heat Emitter

Use a low-wattage ceramic heater that helps you to heat the tank without raising the humidity. Fluker’s ceramic heat emitter is a safe heat emitter that radiates infrared heat without light. This heater can be used as a 24-hour heat source and may help you achieve an optimum level of humidity.

Remember, every tank and every gecko are unique, and what works for one might not work for another. But don’t fret! With a little patience and a spirit of experimentation, you’ll find the perfect balance for your crested gecko.

Tools and Products to Help Control Humidity

Managing humidity in your crested gecko’s tank can seem like a daunting task, but with the right tools, it’s a breeze! Let me share some of my favorites.

1. Digital Hygrometer/Thermometer

One of the most reliable tools in my arsenal is the digital hygrometer/thermometer combo. It allows you to monitor both temperature and humidity levels with accuracy. I’ve found the Zoo Med Labs Digital Thermometer Humidity Gauge to be incredibly reliable. It’s easy to read, super accurate, and it’s small enough to not clutter up the tank.


  • Easy to read display
  • Accurate readings
  • Compact size


  • Requires occasional calibration

2. Reptile Fogging System

If you’re dealing with consistently low humidity levels, a reptile fogging system can be a game-changer. I personally use the Evergreen Pet Supplies Reptile Humidifier/Fogger and it works wonders. It provides a steady stream of cool mist that helps maintain optimal humidity levels.


  • Adjustable fog output
  • Large water tank
  • Automatic shut-off when water runs out


  • Slightly more expensive than other tools

3. Sphagnum Moss

Another must-have for any crested gecko owner is sphagnum moss. This natural substrate retains water and slowly releases it, helping to keep the humidity up. Plus, it’s completely safe for your gecko!


  • Natural and safe
  • Excellent water retention
  • Encourages natural behaviors


  • Needs to be replaced regularly

4. Misting Bottle

For those on a budget or just starting out, a simple misting bottle can do the trick! I’ve been using the Exo Terra Mister for years. Just a few spritzes a day can help keep that humidity in check.


  • Budget-friendly
  • Easy to use
  • Perfect for beginners


  • Requires manual operation
  • May not be sufficient for larger tanks

Each of these tools has its own strengths and weaknesses, but they’ve all been key players in my crested gecko care routine.

Remember, the right tool for you will depend on your specific situation, including the size of your tank, your local climate, and your gecko’s needs. But don’t worry, you’ve got this! And your crested gecko will thank you for the comfortable and healthy environment you’re providing.


Crested gecko humidity all boils down to this: maintaining appropriate humidity levels is key. Too high, and we run the risk of respiratory issues and fungal infections. Too low, and our geckos may face shedding problems and dehydration. It’s all about that sweet spot, right around 50% to 70% during the day and a bit higher at night, mimicking their natural environment.

We’ve journeyed through various methods to lower humidity when it’s excessive. We’ve covered the essential role of ventilation, the importance of the right substrate, and the benefits of incorporating a digital hygrometer into our tank setup. Not to mention, the strategic use of heating elements and how careful water management can make a world of difference!

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