Can a Tank Be Too Big for a Crested Gecko? (Big Tank Sizes)


When you’re looking for a crested gecko tank, the chances are big that you end up looking at either a 10-gallon or a 30-gallon tank. But there are bigger tank sizes available. This poses the question of whether a tank can be too big for a crested gecko?

A tank can never be too big for a crested gecko. Bigger tanks are still small compared to their natural habitat. Big tanks (40-gallon or larger) provide many benefits such as increased volume and height. However, juvenile crested geckos should be housed in standard-sized tanks (up to 30-gallon).

Tanks larger than 30-gallon should not be used for crested geckos that weigh less than 25 grams. Hatchlings and juvenile crested geckos should not be housed in such big tanks because they can have difficulty finding food and water.

A big tank can also be scary for small crested geckos if there aren’t enough hides in them. Such a big tank will also make it more difficult for you to keep an eye on your crested gecko’s health and behavior.

In this article, you’ll learn what big tank sizes are available for crested geckos and the pros and cons of bigger tanks. You’ll also find a few recommended big tanks.

Tank Sizes for Crested Geckos

A lot of reptile brands have vertical terrariums in standard sizes. The descriptions that are given to these tank sizes are different from brand to brand. You can find these standard sizes in the table below (with my own size description).

SizeDimensionsSuitable for
Small8 x 8 x 12 inchesjuveniles (up to 10 g)
Medium12 x 12 x 18 inchesjuveniles (10 to 25 g)
Large18 x 18 x 24 inchesadults (25 g +)

These tank sizes are considered to be suitable for crested geckos. But it doesn’t mean that if you get a bigger tank that it will be too big for them. You have to look at it as (generalized) minimum tank size (although a 20-gallon can also be used for an adult crested gecko).

If you’ve got an adult crested gecko, you can get a tank that is as big as you want. But make sure that the tank is vertical or has at least a height of 36 inches.

When I’m speaking about a big tank, I mean a tank that is bigger than these standard sizes. Most of these big(ger) tanks are at least 40-gallon.

When Is a Tank Too Big?

Although for adult crested geckos a tank can’t be too big, this isn’t true for younger crested geckos. A crested gecko weighing less than 25 grams should be housed in a 10-gallon or smaller, depending on their size and weight.

It’s not for sure that smaller crested geckos wouldn’t thrive in a huge tank, but it would be more difficult for you to check on them. You won’t be able to see if it is pooping and a huge tank will be a challenge for your small crestie to find its food.

Pros and Cons of Big Tanks

A crested gecko can live perfectly fine in a 20-gallon tank or even better in a 30-gallon tank. But some crested gecko owners might want to get a bigger tank that is at least 40-gallon. Although a tank can never be too big for a crested gecko, there are some pros and cons to using a big tank.

Pros of big tanks

More space for decorations and plants

A bigger tank means that you have more floor area and more height to place in various decorations, hides, and plants. You can and should place many vines, branches, plants, and hides in it so your crested gecko can safely explore its territory.

As a general rule, 50 percent of the tank should be filled with plants and vines. The open space should make it possible for your crested gecko to jump from one area to another.

There are many different hides and other decorations available for crested geckos (and other reptiles), but some are big. A big tank will allow you to place in more than one artificial hide and more (bigger) decorations.

More height for jumping and climbing

Crested geckos are arboreal animals and, in their natural habitat, they are masters of disguise. A crested gecko tank should always be vertical or have enough height to allow your gecko to jump and climb.

For hatchlings and small juvenile crested geckos, a tank shouldn’t be too large. They can climb and jump but huge tanks like a 100-gallon tank are not suitable for them. For larger juveniles and adult crested geckos, a large tank is necessary to jump around and climb all over the place.

A big tank will allow your crested gecko to explore its tank and it will encourage him or her to jump and climb like in its natural habitat. A crested gecko that is kept in a small tank will not jump a lot and will have to resort more to climbing.

So for your crested gecko’s wellbeing, it would be recommended to get a very large tank, so your crested gecko has a large territory to explore. This will be a lot better from an animal welfare stance than keeping it in a 20-gallon tank.

Suitable for a pair of crested geckos

If you don’t plan on breeding crested geckos or don’t have any experience with keeping crested geckos, I recommend you get only one crested gecko.

But if you know what you’re doing and decide to keep more than one crested gecko in the same tank, you should get a big enough tank. This will allow your geckos to co-exist with fewer difficulties. A 30-gallon tank is generally recommended for a pair of crested geckos. However, my recommendation would be to get an even bigger tank.

So a big tank (40-gallon or lager) has the added benefit that you can keep more than one crested gecko in it. But always be aware that keeping more than one crested gecko in the same tank can cause fighting. So, keep an eye on them.

Cons of big tanks

Needs to be assembled

The small (12x12x18 inches) and large (18x18x24 inches) tanks sold by different brands don’t need to be assembled and can be used right from the start.

But larger tanks generally need to be assembled by yourself. It isn’t possible to send such assembled tanks by mail. Even disassembled in different pieces, there might be breakage or other damage.

Although you do need to assemble the tank yourself, it isn’t challenging to do so. Most tanks are easy to assemble, but if you don’t want to assemble it you shouldn’t get a big tank. A better option is to get someone else to assemble it for you.

More difficult to clean

A big tank means that there is more glass to clean and more decorations and plants to remove before you can start cleaning. It is also heavier than a smaller tank and can be more difficult to move.

You will have to spend more time removing the cage’s interior and a little more time cleaning the sides, but this difference in time is minor. Although I mention this as a con, it shouldn’t hold you back from getting a big tank. The benefits of a big tank outweigh the slightly more work you have to clean it.

More expensive

If budget isn’t a problem a tank that is larger than 30-gallon won’t be a problem. But most large tanks cost a lot more and, even though you love your gecko, it’s possible that it falls out of your possibilities.

You could house your crestie in a 20-gallon or a 30-gallon tank and save money for a larger tank in a few years. Cresties do live a long time so you have a lot of time to save money for a larger terrarium.

Depending on the size you want, expect to pay at least $300 for a tank that doesn’t fit in the standard sizes. If you want a more custom built tank you can expect to pay up to $5,000 depending on your wants and needs.

Where to Buy Big Tanks?

Nowadays, both standard and big reptile tanks are reasonably easy to find online. Still, there are only a handful of brands that sell tanks that are suitable for crested geckos and don’t follow the standard sizes.

A very large tank that is suitable for crested geckos has to be vertical (high) but also has to provide enough floor area so your crested gecko can spend time on the ground when it wants to. A large enough floor area also allows you to place in bigger decorations and hides.

When you’re looking to buy a very large crested gecko tank, I would recommend the following tanks:

You should be aware that big tanks always need to be assembled by you but with clear instructions this won’t be a problem. 

If you have a very large budget and a lot of space in your home you can also get a custom-built crested gecko tank from Adam’s Specialty Products, LLC. They sell all kinds of large and huge tanks that are built to your own desire.

Want to Learn More?

If you want to learn more about crested geckos as pets, please read the following articles.

If you’re interested in getting crested geckos as pets you should also definitely read our article about baby and juvenile crested gecko care or (adult) crested gecko care.


Kevin N.

Kevin is the owner of My Crested Gecko. He wrote this blog for many years and has been a geckos enthusiast his entire life, but only became an official "geckophile" five years ago when he acquired one as a pet! Kevin knows how to care for hamsters, guinea pigs, rabbits, and degus in addition to crested geckos which are more than happy with him every day!

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