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12 Reptiles That Can Live In A 100-Gallon Tank Forever

reptiles for 100-gallon tank

Do you have a 100-gallon tank and want to know what reptiles you can keep in it? A 100-gallon tank may seem big, but even that may not be large enough for some reptiles.

There are many reptiles that are perfect for a 100-gallon tank, including the Uromastyx, the Mountain Horned Dragon, the Panther Chameleon, the Green Tree Python, the Gopher Snake, the Ball Python, the Carpet Python, Yellow-Bellied and Red-Eared Slider Turtles, the African Sideneck Turtle, and the Western Painted Turtle.

Larger reptile species like Bearded Dragons and Green Iguanas can also be kept in a 100-gallon tank as juveniles.

Tank size is critical when it comes to reptile health. A reptile that is too large for its tank will be stressed, which can lead to illness or even death.

The bigger the tank, the bigger the reptile that can be kept in it. In this article, we will go over some of the best reptiles that would make a great addition to your 100-gallon tank.

Lizards That Can Live In A 100-Gallon Tank

A general rule of thumb is that your reptile tank should be at least twice as long as the lizard inside it, including the tail. This provides enough space for it to move around comfortably and naturally.

The height of the tank should also be at least 65% of the lizard’s length if it is a ground-dwelling species, and much higher if it is arboreal (likes to live in trees). A reptile habitat that is 36” x 18” x 36” is equivalent to a 100-gallon tank and is tall enough for most arboreal species that are suitable for a tank this size.

Based on this, a 100-gallon reptile tank that is 3 feet long can house lizards up to 18 inches long. Many species that grow larger can be kept in a 100-gallon tank for a while and moved to a larger one when they outgrow it.

For those who don’t want to have to upgrade to bigger tanks later, here are a few suggestions for lizards that grow up to 18 inches and can be kept in a 100-gallon tank forever.

1. Uromastyx

Uromastyx ornata can reach 15 inches (38 cm) in length.

Uromastyx look a bit like bearded dragons without beards and most of their spikes. They come from deserts in Africa, the Middle East, Asia, and India. Two of the most common pet species are the Mali and the Saharan uromastyx.

The adult uromastyx is generally 18 inches or less, except for the Egyptian uromastyx which can grow to over 30 inches in length. The adult Egyptian should not be kept in a 100-gallon tank.

Do you want to get an uromastyx? We have created an uromastyx care guide to help you. Read it here!

2. Mountain Horned Dragon (Acanthosaura capra)

Mountain Horned Dragon

Mountain horned dragons are arboreal. Their mature size is about 10-12 inches long, so they will be very comfortable in a 100-gallon tank.

In the wild, they spend their time in rainforest canopies and near running water. When choosing an enclosure for these animals, be sure to consider the height and whether it can maintain the temperature and humidity that this species needs.

3. Panther Chameleon (Furcifer Pardalis)

Panther Chameleon

Panther chameleons are native to the northern and coastal areas of Madagascar where they live in trees and bushes, mostly in the coastal lowlands where it is warm and humid.

Like the mountain horned dragon, their habitat needs to accommodate their climbing behavior and temperature and humidity requirements.

Males are significantly larger than females, with mature males getting 14-21 inches in length, and females only 9-13 inches. Larger males may eventually need a bigger tank.

Interested in getting a panther chameleon? Read our panther chameleon care guide to learn everything you need to know about these awesome reptiles!

4. Female Veiled Chameleon (Chamaeleo calyptratus)

Veiled Chameleon
Female veiled chameleon.

The veiled chameleon is native to the southwestern Arabian Peninsula, where climates are semi-arid and tropical. Like other types of chameleons, it is arboreal and needs to be housed in a taller tank.

Tip: If you are thinking about getting a veiled chameleon, read our veiled chameleon care guide here!

Male veiled chameleons grow up to 24 inches and will usually grow too large to be permanently housed in a 100-gallon tank. Females, however, only grow to 10-14 inches long and would be perfect in a tank this size.

A male veiled chameleon. Males are usually more colorful (and bigger).

Snakes That Can Live In A 100-Gallon Tank

The minimum length of a tank should be at least half the length of the snake. Like lizards, the height of the tank should be appropriate for their natural behavior, e.g., taller tanks for snakes that like to climb.

A 100-gallon tank that is 3 feet long can house most species of snakes that grow to 6 feet in length.

5. Green Tree Python (Morelia viridis)

Green Tree Python
Close up side profile portrait of beautiful Green tree python (Morelia viridis) looking into camera, low angle view

They thrive in tropical rainforests that are teeming with vegetation and high humidity levels. The majority of their time is spent in trees.

Green tree pythons can grow to be approximately 5-6 feet long. They need to be housed in a tall tank suitable for arboreal species.

6. Gopher Snake (Pituophis catenifer)

Gopher Snake

The gopher snake is found across North America in all different types of habitats. This species occurs in many different habitats, including prairies, forests, and deserts.

These snakes can grow to be 8 feet long. However, most mature gopher snakes are less than 6 feet long and are quite comfortable in a 100-gallon tank.

7. Ball Python (Python regius)

Ball Python

Ball pythons are indigenous to West and Central Africa. In the wild, they typically inhabit savannas and grasslands.

These snakes are named for the way they behave when they feel threatened. Instead of slithering away or striking out, they curl into a tight ball to appear smaller.

Ball pythons are one of the smallest of the python species. They can grow up to 5 feet, but they more commonly grow to 2-4 feet long.

Wanna learn more about ball pythons? Read our ball python care guide here!

8. Carpet Pythons (Morelia spilota cheynei)

Carpet Pythons
Jungle carpet python

Carpet pythons are medium-sized snakes characterized by their vibrant markings.

Adults are between 6 and 12 feet long, and the average is 8 feet. Smaller adults can live comfortably in a 100-gallon tank. If they grow much larger than this, you will need to upgrade to a bigger tank.

Turtles That Can Live In A 100-Gallon Tank

A 100-gallon tank can house turtles with shells about 10 inches in length. The enclosure should have a section for the turtle to swim that is at least 8 inches deep, as well as a dry area for it to bask or walk.

9. Yellow-Bellied Slider (Trachemys scripta scripta)

Yellow-Bellied Slider

Yellow-bellied sliders are basking turtles that are found in abundance in the southeast United States and are popular as pets. They are semi-aquatic, spending much of their time floating in the water and coming out on land to bask.

At maturity, the shells of these turtles reach 5-12 inches in length. Juveniles eat primarily aquatic insects, while adults mainly eat vegetation.

10. Red-Eared Slider (Trachemys scripta elegans)

Red-Eared Slider

Red-eared sliders are very much the same as yellow-bellied sliders in size, behavior and needs. They are native to the Mississippi river but have been seen in many other states and some parts of Canada.

Red-eared sliders kept as pets are often released into the wild, which explains their presence in locations other than the Mississippi. Many released sliders do very well in the wild, and they are considered an invasive species in some areas.

11. African Sideneck Turtle (Pelomedusa subrufa)

African Sideneck Turtle

Also known as the African mud turtle, the African sideneck turtle gets its name from its lack of ability to tuck its head all the way into its shell. Instead, it draws its head sideways under the upper edge of the shell.

The average adult African sideneck’s size falls between 7 to 12 inches, with females averaging a greater size than males. They are known for their longevity, with some reports suggesting they can live more than 50 years in captivity.

12. Western Painted Turtle (Chrysemys picta bellii)

Painted Turtle

The painted turtle is a freshwater species prevalent in North America, typically residing in ponds, slow-moving rivers and creeks, and murky bogs. They need a habitat with fresh water, a soft bottom, basking sites, and aquatic plants.

Mature female turtles reach 12 inches in shell length. Males are smaller with an average shell length of 10 inches.

Larger Reptiles That Can Live In A 100-Gallon Tank As Juveniles

If you’re looking to buy a larger reptile but only have a 100-gallon tank, no worries! You can still get one of these larger animals and house it in your tank, although you will have to upgrade to a larger habitat as your pet matures.

Here are a few of the options available to you.

Bearded Dragon (Pogona vitticeps)

Bearded Dragon
The minimum tank size for bearded dragons is 55 gallons. For smaller dragons, this can be enough, but for bigger beardies, a 120-gallon tank is way better since they are active animals when kept right.

Beardies can easily be kept in a 100-gallon tank for the first year of life but will need to be moved soon after. They mature at about 18 months of age, reaching up to 24 inches in length.

If you want to get a bearded dragon, we highly recommend reading our bearded dragon care guide here!

Green Basilisk (Basiliscus plumifrons)

Green Basilisk

Green Basilisks are 24-36 inches long when mature. They can be kept in a 100-gallon tank for the first year, then upgraded to a larger tank after that.

Savannah Monitor (Varanus exanthematicus)

Savannah Monitor

Savannah monitors reach 30-48 inches in length. They can mature as early as 2 years, though many grow slower and mature in 3 to 4 years.

Read our savannah monitor care guide if you would like to get a savannah monitor or already have one!

Green Iguana (Iguana iguana)

Green Iguana

Green Iguanas can be as long as 6 feet from nose to tail, with most of this length being tail. At 6 months they will be 20-27 inches long, meaning a 100-gallon tank will be suitable for them for just a few months.

Freckled Monitor (Varanus tristis orientalis)

Freckled Monitor

Freckled monitors grow up 24 inches long, with half of that being tail. At maturity, they are too big to be permanently housed in a 100-gallon tank and will need to be moved to a larger tank before they are 2 years old.

Green (Emerald) Tree Monitor (Varanus prasinus)

Emerald Tree Monitor

Mature green tree monitors can be up to 36 inches long, with females being slightly smaller. These reptiles grow very rapidly and are likely to outgrow a 100-gallon tank before they are a year old.


Many snakes that are larger when mature can be comfortably housed in a 100-gallon tank for at least the first year of life.

This includes many of the boa and python species. Check our other articles below to see what snakes we recommend.

Smaller Reptiles Can Live In A 100-Gallon Tank

In this article, we’ve talked about larger reptiles that can live in 100-gallon tanks their whole lives as well as those that can live in these tanks as juveniles.

However, let’s not forget about all of the smaller reptiles that would be very happy with such spacious accommodations!

Have a look at these articles to learn more about smaller reptiles that can also be kept in your 100-gallon tank:

In Conclusion

A 100-gallon tank can be a great habitat for a variety of reptiles, both large and small. Whether you’re looking for a pet that will grow to be quite large or one that will stay relatively small, there is sure to be a reptile that would be happy in your new tank.

Be sure to do your research before bringing any new pet home, so you know what kind of care they will need and how big they will get as they mature.

Pierre And The ReptileCraze Team