Skip to content
Vet RanchVet Ranch
  • Home
  • Pet Animals
    • Dog
      • Dog Crate
      • Dog House
      • Dog Nail
      • Dog Shampoo
      • Dog Bed
      • Dog Harness
      • Dog Door
      • Dog Muzzles
      • Dog Car Seat
      • Dog Feeder
      • Dog Harness
      • Dog Kennel
      • Dog Pen
    • Cat
      • Cat Carrier
      • Cat Clipper
      • Cat Couch
      • Cat exercise wheel
      • Cat Litter
      • Cat Litter Box
      • Cat scratching post
      • Cat stroller
      • Cat Tracker
      • Cat Tree
      • Cat Vacuum
    • Bird
      • Bird Camera Feeder
      • Bird Stand
      • Bird Bath
      • Bird Cage
      • Bird Crate
      • Bird Feeder
      • Bird Seed
    • Rabbit
      • Rabbit Cage
      • Rabbit Hutch
    • Fish
      • Fish Tank
      • Fish Aquarium
    • Pet Stroller
  • Knowledge
    • Best Product
    • Review
    • Blog
  • About Us
  • Contact Us
  • Write for Us
Vet RanchVet Ranch
  • Home » 
  • Gecko » 
  • 2 Leopard Gecko Tank Size

2 Leopard Gecko Tank Size

Arthur Crowley October 20, 2023

Geckos are remarkable animals that create great pet dogs. They come in a selection of colors and patterns and also have distinct characteristics that make them attract attention. However, creating the 2 Leopard Gecko Tank Size environment for your gecko can be a difficult task, specifically if you are new to the world of reptile maintaining. In this article, we’ll direct you with the 2 Leopard Gecko Tank Size ways to create the perfect gecko container for your family pet.

Contents
  1. 2 Leopard Gecko Tank Size – Complete Review And Acquiring Guide
    1. Helidrago Bearded Dragon Tank Accessories, Reptile Substrate Floor for Bearded Dragon Enclosure 4x2x2, Leopard Gecko Tank Liner Mat for 120 Gallon Reptile Tank
      1. Features
    2. BSRESIN 2 PCS Rectangle Reptile Thermometer and Humidity Gauge for Bearded Dragon Accessories, Reptile Tank Accessories for Jumping Spider, Leopard Gecko, Hermit Crab, Gecko, Ball Python, Lizard
      1. Features
    3. 10PCS Crested Gecko Tank Accessories, Reptile Plants Bridge Vines, Coconut Shell with Ladder for Lizard, Chameleon Cage, Snakes, Hermit Crab, Leopard Gecko Tank Accessories, Terrarium Decor
      1. Features
    4. Jinymral Leopard Gecko Tank Accessories, Adjustable Climbing Toys Supplies, Terrarium Habitat Decor
      1. Features
    5. Jinymral Leopard Gecko Tank Accessories, Cute Reptile Hideout Cave, Essential Tank Terrarium Habitat Decor, Adjustable Toys Supplies
      1. Features
    6. PINVNBY Natural Coconut Reptile Hideouts Lizard, Coco Hut Hermit Crab Hut Aquarium Fish Hide Cave for Small Reptile Crested Gecko Leopard Gecko Spider Snail Climber Toys (2 PCS Natural Surface)
      1. Features
    7. Halatool 2Pack Leopard Gecko Substrate Natural Coconut Fiber Substrate for Reptiles Premium Coco Husk Terrarium Bedding for Tortoise Habitat Snake Lizard Hermit Crab Tarantula Enclosure Worm Bin Frog
      1. Features
  2. 1. Storage tank Size:
  3. 2. Substratum:
  4. 3. Warmth and Lighting:
  5. 4. Hides:
  6. 5. Food as well as Water:
  7. Final thought:

2 Leopard Gecko Tank Size – Complete Review And Acquiring Guide

Check out our top products that you can purchase:

1
Helidrago Bearded Dragon Tank Accessories, Reptile Substrate Floor for Bearded Dragon Enclosure 4x2x2, Leopard Gecko Tank Liner Mat for 120 Gallon Reptile Tank
Helidrago Bearded Dragon Tank Accessories, Reptile Substrate Floor for Bearded Dragon Enclosure...
BUY NOW Amazon.com
9.4
BUY NOW
Amazon.com
2
BSRESIN 2 PCS Rectangle Reptile Thermometer and Humidity Gauge for Bearded Dragon Accessories, Reptile Tank Accessories for Jumping Spider, Leopard Gecko, Hermit Crab, Gecko, Ball Python, Lizard
Recommended
BSRESIN 2 PCS Rectangle Reptile Thermometer and Humidity Gauge for Bearded Dragon Accessories,...
BUY NOW Amazon.com
9.3
BUY NOW
Amazon.com
3
10PCS Crested Gecko Tank Accessories, Reptile Plants Bridge Vines, Coconut Shell with Ladder for Lizard, Chameleon Cage, Snakes, Hermit Crab, Leopard Gecko Tank Accessories, Terrarium Decor
High quality
10PCS Crested Gecko Tank Accessories, Reptile Plants Bridge Vines, Coconut Shell with Ladder for...
BUY NOW Amazon.com
8.8
BUY NOW
Amazon.com
4
Jinymral Leopard Gecko Tank Accessories, Adjustable Climbing Toys Supplies, Terrarium Habitat Decor
Jinymral Leopard Gecko Tank Accessories, Adjustable Climbing Toys Supplies, Terrarium Habitat Decor
BUY NOW Amazon.com
8.4
BUY NOW
Amazon.com
5
Jinymral Leopard Gecko Tank Accessories, Cute Reptile Hideout Cave, Essential Tank Terrarium Habitat Decor, Adjustable Toys Supplies
Jinymral Leopard Gecko Tank Accessories, Cute Reptile Hideout Cave, Essential Tank Terrarium...
BUY NOW Amazon.com
8.1
BUY NOW
Amazon.com
6
PINVNBY Natural Coconut Reptile Hideouts Lizard, Coco Hut Hermit Crab Hut Aquarium Fish Hide Cave for Small Reptile Crested Gecko Leopard Gecko Spider Snail Climber Toys (2 PCS Natural Surface)
PINVNBY Natural Coconut Reptile Hideouts Lizard, Coco Hut Hermit Crab Hut Aquarium Fish Hide Cave...
BUY NOW Amazon.com
7.1
BUY NOW
Amazon.com
7
Halatool 2Pack Leopard Gecko Substrate Natural Coconut Fiber Substrate for Reptiles Premium Coco Husk Terrarium Bedding for Tortoise Habitat Snake Lizard Hermit Crab Tarantula Enclosure Worm Bin Frog
Halatool 2Pack Leopard Gecko Substrate Natural Coconut Fiber Substrate for Reptiles Premium Coco...
BUY NOW Amazon.com
6.3
BUY NOW
Amazon.com

*Note: The score is based on our AI score (Editor’s choice and rating).
Helidrago Bearded Dragon Tank Accessories, Reptile Substrate Floor for Bearded Dragon Enclosure 4x2x2, Leopard Gecko Tank Liner Mat for 120 Gallon Reptile Tank

Helidrago Bearded Dragon Tank Accessories, Reptile Substrate Floor for Bearded Dragon Enclosure 4x2x2, Leopard Gecko Tank Liner Mat for 120 Gallon Reptile Tank

$24.99
$21.69
 in stock
BUY NOW
Amazon.com
as of October 6, 2025 10:31 am

Features

  • Unlike reptile carpet, reptile tank liner is easy to spot clean and fully clean. This reptile substrate is a great low-maintenance option to maintain a clean and convenient environment
  • Textured surface design helps reptiles get a better grip throughout the reptile cage and avoid slipping, joint injury and accidental ingestion
  • Durable materials ensure you can wash this earth-friendly liner and reuse it, you don't have to waste trees on paper towels. Let's passionate about our planet
  • Easy to trim to size and lays flat without any issues for a variety of reptile terrarium and enclosures. 23.6 inches in width and 59 inches in length
  • This terrarium bedding is great for use with a wide variety of snakes, crested geckos, leopard geckos, lizards, tortoises, hermit crab and bearded dragons
BSRESIN 2 PCS Rectangle Reptile Thermometer and Humidity Gauge for Bearded Dragon Accessories, Reptile Tank Accessories for Jumping Spider, Leopard Gecko, Hermit Crab, Gecko, Ball Python, Lizard

BSRESIN 2 PCS Rectangle Reptile Thermometer and Humidity Gauge for Bearded Dragon Accessories, Reptile Tank Accessories for Jumping Spider, Leopard Gecko, Hermit Crab, Gecko, Ball Python, Lizard

$5.99  in stock
BUY NOW
Amazon.com
as of October 6, 2025 10:31 am

Features

  • Reptile Necessary: Meet the need of Humidity and Temperature measuring for monitoring reptile's living conditions and health. Easily check your pet's living environment. When there are abnormalities, you can timely discovery through reptile thermometer.
  • Package Included: You will receive 2pcs black reptile tank thermometers, rectangle shape, set in button cell with 1.5V, life with 3 months. Please note that there are only Fahrenheit facility.
  • Easy to Use: Rectangle screen digital display of reptile tank accessories can clearly display the temperature and humidity of the environment. Just stick the dot glue anywhere in the reptile tank, the environment’s data will be show. So easy!
  • Widely Apply for Reptile: The reptile thermometer and humidity gauge can be widely suitable for reptile’s living environment monitoring, such as jumping spider, leopard gecko, hermit crab, bearded dragon, crested gecko, ball python, leopard geck, lizard, axolotl , chameleon cage, snake, etc.
  • Fast Response and Accurate Readings: 5 seconds fast sampling response and accurate digital readings updated, which is provided a perfect enclosure for your cute reptile. Reptile thermometer range from -58°F to +158°F(±1°F), humidity range from 10% to 99% RH(±5%).
10PCS Crested Gecko Tank Accessories, Reptile Plants Bridge Vines, Coconut Shell with Ladder for Lizard, Chameleon Cage, Snakes, Hermit Crab, Leopard Gecko Tank Accessories, Terrarium Decor

10PCS Crested Gecko Tank Accessories, Reptile Plants Bridge Vines, Coconut Shell with Ladder for Lizard, Chameleon Cage, Snakes, Hermit Crab, Leopard Gecko Tank Accessories, Terrarium Decor

$19.99
$18.99
 in stock
BUY NOW
Amazon.com
as of October 6, 2025 10:31 am

Features

  • 【PACKAGE INCLUDE】Gecko tank accessories includes 1 x reptile coconut hut,1x Bearded dragon hammock; ,1x Flexible Bendable Bridge; 1x hanging plant; 1 reptile vines; 1 x leaves;4x water grass flower ball; The attractive coconut hut is full of primitive, and decorative plants to give your pet a comfortable reptile habitat.
  • 【Material Safety】 The reptile toy is made from natural coconut shell, ensuring it is 100% safe, non-toxic, and durable. The wooden rope ladder and hemp fibers offer a variety of natural textures, promoting muscle development in lizards. The vines are crafted from high-quality PU and iron wire, making them highly flexible and lifelike, mimicking a natural jungle environment.
  • 【Perfect Hiding Place】 The hanging coconut shell offers a quiet, secure retreat for reptiles, shielding them from light and noise. Ideal for crested and leopard geckos, it provides a cozy hideout and food storage, ensuring privacy and comfort.
  • 【Perfect Reptile Tank Carpet】The coconut shell provides a spot for food and treats, while also serving as a hideout and resting place. The wooden bridge allows reptiles to exercise, mimicking their natural environment. This durable, rust-free gecko hut withstands extreme weather, making it ideal for both indoor and outdoor use, with rustic charm and functionality.
  • 【Ideal for Reptiles & Amphibians】The sleek design provides a comfortable space for your pet to quickly acclimate. Suitable for a wide range of reptiles and arthropods, including bearded dragons, crabs, frogs, geckos, snakes, and more. This set offers great value, providing all the essential accessories for your bearded dragon tank in one purchase.
Jinymral Leopard Gecko Tank Accessories, Adjustable Climbing Toys Supplies, Terrarium Habitat Decor

Jinymral Leopard Gecko Tank Accessories, Adjustable Climbing Toys Supplies, Terrarium Habitat Decor

$10.97  in stock
BUY NOW
Amazon.com
as of October 6, 2025 10:31 am

Features

  • Package Include: You will receive a 7.87 inches x 5.12 inches x 1.18 inches collapsed leopard gecko climbing toy miniature small package, unfold it and it measures approximately 16 inches (L) . You can freely adjust its crawling height according to the size of the leopard gecko tank.
  • Premium Material: Jinymral leopard gecko climbing toy is made by hand using forest moss as the raw material. excellent moisturizing properties, which can aid in shedding, providing a moist surface for the reptiles to facilitate the shedding process. Universal application in terrarium habitat decor. It is a good reptile climbing toy for snake, lizard, bearded dragon, hermit crab, chameleon, frog, leopard gecko tank decoration.
  • Robust and Durable: Jinymral leopard gecko climbing toy is made of 5mm horticultural aluminum rods as the inner core, which are strong and durable without rusting, safe for reptile, and can be easily bent repeatedly, You can adjust the height of the climbing bar yourself.
  • Easy to Use: Step 1: Unwrap the bag and remove the folded leopard gecko climbing toy. Step 2: Manually return the folded climbing toy to its ready-to-use state, with the climbing height adjustable by you. Step 3: Spray water on the climbing toy to moisten its exterior and help the leopard gecko adapt to the new toy faster. Step 4, place the prepared leopard gecko crawling toy in the appropriate position of the leopard gecko tank.
  • Attention: Jinymral leopard gecko climbing toys are made of natural fibers, please do not let it dry excessively or its natural fibers will easily become brittle and fall off. You need to keep an eye on its drying condition and spray it with water properly to ensure that it stays in good "working condition".
Jinymral Leopard Gecko Tank Accessories, Cute Reptile Hideout Cave, Essential Tank Terrarium Habitat Decor, Adjustable Toys Supplies

Jinymral Leopard Gecko Tank Accessories, Cute Reptile Hideout Cave, Essential Tank Terrarium Habitat Decor, Adjustable Toys Supplies

$12.97  in stock
BUY NOW
Amazon.com
as of October 6, 2025 10:31 am

Features

  • Package includes: You will receive an 11.42 inches x 10.242 inches x 0.63 inches unfolded leopard gecko hide cave toy package, which measures about 6 inches (L) * 4 inches (W) * 3 inches (W) when folded. You can easily and quickly fold up the hideout.
  • Premium Material: Jinymral leopard gecko hideout cave toys are handmade from forest moss with excellent moisturizing properties to effectively increase the humidity of the reptile home ,hide for pet reptile leopard gecko, frogs and snakes.
  • Sturdy and durable: the walls of the Jinymral leopard gecko hide cave are made of galvanized wire mesh, which is durable, will not rust, is safe for reptiles and can be easily bent and folded over and over again, so you can adjust the shape, making it a beautiful decoration for your reptile tank!
  • Easy to use: Step 1: Unpack the bag and take out the unfolded leopard gecko hide and seek toys. Step 2: Manually return the folded hide and seek toy to its ready-to-use state, according to the product instructions. Step 3: Place the prepared Leopard Gecko Climbing Toy in the appropriate location of the Leopard Gecko Tank. Step 4: If the environment requires it you can spray water on the hideout toy to bring more comfy and fun to reptiles
  • Attention: Jinymral leopard gecko hide cave toys are made of natural fibers, please do not let it dry excessively or its natural fibers will easily become brittle and fall off. You need to keep an eye on its drying condition and spray it with water properly to ensure that it stays in good "working condition".
PINVNBY Natural Coconut Reptile Hideouts Lizard, Coco Hut Hermit Crab Hut Aquarium Fish Hide Cave for Small Reptile Crested Gecko Leopard Gecko Spider Snail Climber Toys (2 PCS Natural Surface)

PINVNBY Natural Coconut Reptile Hideouts Lizard, Coco Hut Hermit Crab Hut Aquarium Fish Hide Cave for Small Reptile Crested Gecko Leopard Gecko Spider Snail Climber Toys (2 PCS Natural Surface)

$9.99  in stock
BUY NOW
Amazon.com
as of October 6, 2025 10:31 am

Features

  • Natural coconut materials: Our reptile hideout is made from natural coconut shells to provide a safe and comfortable hiding place for your lizard, leopard gecko, snake, hermit crab, spider, frog, or other small reptile
  • Strong and durable: The durable construction ensures long-lasting use, while the natural surface of the coconut shell adds an authentic touch to your pet's habitat. Give you peace of mind to use these hermit crab accessories
  • Hideout and climbing toy: This coconut hut is a hideout for your hermit crab and a climbing toy. It provides them with a safe and private space to rest while making them exercise and explore
  • Good size for small pets: Whether you have a leopard gecko tank, a snake aquarium, or a hermit crab habitat, our coconut shell is a perfect match. A 2.36-inch wide entry point for easy access and encourages natural behavior
  • Good workmanship: We prioritize the safety and well-being of your pets. Our coconut hide is made from simple processing of raw materials to ensure it is safe for your pet. Smooth edges and sturdy construction prevent any damage
Halatool 2Pack Leopard Gecko Substrate Natural Coconut Fiber Substrate for Reptiles Premium Coco Husk Terrarium Bedding for Tortoise Habitat Snake Lizard Hermit Crab Tarantula Enclosure Worm Bin Frog

Halatool 2Pack Leopard Gecko Substrate Natural Coconut Fiber Substrate for Reptiles Premium Coco Husk Terrarium Bedding for Tortoise Habitat Snake Lizard Hermit Crab Tarantula Enclosure Worm Bin Frog

$13.71
$12.99
 in stock
BUY NOW
Amazon.com
as of October 6, 2025 10:31 am

Features

  • : Halatool's leopard gecko substrate contains two 7.87"x3.94"x1.97" bricks (1.4lb each) of pure coconut husk fiber - enough to fill a 4.2-gallon terrarium. This organic, reusable bedding is cleaned with no dirt or foreign substances, providing the safest leopard gecko bedding for sensitive reptiles
  • & : Our coconut fiber substrate creates the perfect level of humidity (60-80%) for hermit crabs, snails, and other moisture-loving pets to assist healthy shedding while preventing excessive dampness. The fibrous structure allows excellent aeration, reducing belly scale abrasions and encouraging natural burrowing behaviors your leopard gecko, tortoise, crested gecko, tarantula instinctively craves
  • & : Unlike inferior substrates, our bedding naturally breaks down waste and minimizes odors through superior absorption. This creates a cleaner habitat that reduces cleaning frequency while keeping your lovely reptiles' environment fresh and comfortable
  • - : Each compressed brick expands to 3x its size when soaked (simply add water and let dry 1-2 days if too moist). This budget-friendly coconut fiber substrate outperforms commercial alternatives by maintaining ideal humidity longer, reducing misting needs by up to 30%
  • ️ : The ultra-soft texture mimics the loose soils of your gecko's native arid environment while being completely digestible if accidentally ingested. Lightweight yet durable, it stores easily as compact bricks then transforms into lush bedding that satisfies all natural digging and hiding instincts

1. Storage tank Size:

The first thing to consider when setting up a gecko storage tank is the dimension of the storage tank. Geckos come in different sizes, which indicates that you’ll require to select the right container dimension as necessary. A great rule of thumb is to choose a storage tank that is at the very least 20 gallons in dimension. This will provide adequate room for your gecko to move around freely and also have the ability to exhibit its normal actions.

2. Substratum:

The substrate is the product that lines all-time low of the container. Choosing the ideal substratum is necessary for your gecko’s health and wellness and also cleanliness. The very 2 Leopard Gecko Tank Size substratum selection for geckos is paper towel or reptile carpeting. This substratum will assist you monitor your gecko’s waste and also tidy the container much more quickly.

3. Warmth and Lighting:

Geckos are cold-blooded pets, which indicates that they need a warm resource in the container to regulate their body temperature. A warm lamp or an under container heating pad can offer the necessary warm for your gecko. Lighting is likewise vital to aid your gecko preserve a healthy and balanced body clock. A UVB light is crucial for geckos since they require the vitamin D it provides to refine calcium.

4. Hides:

Geckos like to really feel secure, as well as they love to hide. Hides can be anything from natural-looking rocks to commercially readily available plastic or wooden hides. You’ll require to supply a minimum of two hides in the storage tank, one on the warm side and also an additional on the awesome side, to permit your gecko to manage its temperature level as well as really feel risk-free.

5. Food as well as Water:

Geckos are insectivores as well as call for a diet composed of bugs such as crickets, mealworms, and waxworms. You can also choose to feed your gecko commercially available gecko food. Water is additionally essential for your gecko’s wellness. Make sure that there is a superficial water meal in the storage tank, with fresh water constantly readily available.

Final thought:

Creating a excellent habitat for your gecko takes a bit of planning and initiative, but the rewards deserve it. The very 2 Leopard Gecko Tank Size gecko container need to be large, tidy, and simulate the gecko’s natural environment. By adhering to the guidelines discussed over, you can produce a comfy residence for your animal. Always remember to look into the specific demands of your gecko species before establishing the tank to guarantee you are creating the ideal atmosphere for your pet to prosper.

Share
facebookShare on FacebooktwitterShare on TwitterpinterestShare on Pinterest
linkedinShare on LinkedinvkShare on VkredditShare on ReddittumblrShare on TumblrviadeoShare on ViadeobufferShare on BufferpocketShare on PocketwhatsappShare on WhatsappviberShare on ViberemailShare on EmailskypeShare on SkypediggShare on DiggmyspaceShare on MyspacebloggerShare on Blogger YahooMailShare on Yahoo mailtelegramShare on TelegramMessengerShare on Facebook Messenger gmailShare on GmailamazonShare on AmazonSMSShare on SMS
Post navigation
Previous post

Rock Leopard Gecko Tank

Next post

Leopard Gecko Tank Kit

Arthur Crowley

Arthur Crowley

To provide you with the expert assistance you need, Vet Ranch with licensed veterinarians can answer your health-related pet issues.

For the purpose of sharing knowledge with each other, we have jointly created this website, where you can get useful information from us and also where we expand our knowledge through your comments from you.

Related Posts

2 Leopard Gecko Tank Size

Leopoard Gecko Do I Keep Vitimin In The Tank

2 Leopard Gecko Tank Size

Minimum Tank Size For Gecko

2 Leopard Gecko Tank Size

Leopard Gecko Decor For 75 Gallon Tank

2 Leopard Gecko Tank Size

Thermometer For Gecko Tank

2 Leopard Gecko Tank Size

Fruit Flies In Gecko Tank

2 Leopard Gecko Tank Size

Forest Looking Gecko Tank

2 Leopard Gecko Tank Size

Leopard Gecko In A 40 Gallon Tank

2 Leopard Gecko Tank Size

Leopard Gecko Cleaning Tank

Affiliate disclaimer

Vet Ranch (vetranch.org) is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.

Amazon and the Amazon logo are trademarks of Amazon.com, Inc, or its affiliates.

Affiliate Disclaimer

Vet Ranch (vetranch.org) is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. Amazon and the Amazon logo are trademarks of Amazon.com, Inc, or its affiliates.

Category

Best Product

Review

Blog

Page

  • About Us
  • Contact Us
  • Affiliate Disclaimer
  • Privacy Policy

Follow us on social

VET RANCH LOGO
FacebookFacebookTwitterInstagramYoutubeYoutube
Copyright © 2025 Vet Ranch
Your privacy

By selecting "Accept all cookies," you consent to Vetranch storing cookies on your device and disclosing information in accordance with our Privacy policy

Menu
  • Home
  • Pet Animals
    • Dog
      • Dog Crate
      • Dog House
      • Dog Nail
      • Dog Shampoo
      • Dog Bed
      • Dog Harness
      • Dog Door
      • Dog Muzzles
      • Dog Car Seat
      • Dog Feeder
      • Dog Harness
      • Dog Kennel
      • Dog Pen
    • Cat
      • Cat Carrier
      • Cat Clipper
      • Cat Couch
      • Cat exercise wheel
      • Cat Litter
      • Cat Litter Box
      • Cat scratching post
      • Cat stroller
      • Cat Tracker
      • Cat Tree
      • Cat Vacuum
    • Bird
      • Bird Camera Feeder
      • Bird Stand
      • Bird Bath
      • Bird Cage
      • Bird Crate
      • Bird Feeder
      • Bird Seed
    • Rabbit
      • Rabbit Cage
      • Rabbit Hutch
    • Fish
      • Fish Tank
      • Fish Aquarium
    • Pet Stroller
  • Knowledge
    • Best Product
    • Review
    • Blog
  • About Us
  • Contact Us
  • Write for Us
FacebookTwitterPinterest