If you’re an aquarium enthusiast with a limited space, you’re likely searching for the best small fish for small tanks that can thrive in compact environments. With the rise of apartment living and a growing interest in aquascaping, finding the right small fish species has become essential for hobbyists. In this article, we’ll explore the top 10 small fish available on Amazon in 2024, ensuring you find the perfect addition to your aquatic sanctuary.
Bestseller No. 1
Tetra 1 Gallon Half Moon Small Fish Tank w/ Movable LED Light, For Betta & Gold Fish, Aquarium
- AQUARIUM KIT: Clear plastic, half moon-shaped front allows unobstructed viewing.
- MOVABLE LIGHT: LED light can be positioned to light tank from above or below – requires 3 AA batteries (not included).
- IDEAL FOR BETTAS: Bettas have large, heavy fins that weigh them down, so they do not need a lot of space; bettas require minimal maintenance and make a great species for beginners.
- CONVENIENT: Clear canopy has a hole to make feeding fish easy.
- 1.1 GALLON TANK: Small size that’s perfect for a desktop or in any room (9 inches x 10.5 inches x 4.5 inches).
Bestseller No. 2
DaToo Mini Aquarium Heater 25W Small Fish Tank Heater 25 Watt with Free Thermometer Sticker
- 25W Betta Aquarium Heater: Creating and maintaining a perfect and comfortable water temperature for our cute fish is not easy, which requires a lot of effort. Now DaToo MINI 25W Aquarium Heater can help you make this easier. Precise and constant temperature, no need to set, keep the temperature of fish habitat in the best state at all times. You will find it very easy and happy to take care of pet fish！
- Precise And Constant Temperature: No need to set, DaToo Fish Tank Heater will automatically keep the water temperature of the fish habitat at 78℉. This temperature is very suitable for betta and most tropical fish. When the water temperature is lower than 78℉, the heater starts to heat and the red light is on. When the temperature reaches 78℉, the heater stops heating and the green light is on. DaToo will always maintain this comfortable temperature for your beloved fish!
- The Smallest 25W Betta Heater: For most fish lovers who have small fish tanks of 1 to 5 gallons, a small heater means more space for fish. This is the smallest 25W aquarium heater on the market, only 0.2 inches. No matter how small your fish tank is, it can be used perfectly in it, and you can't even find it. Very MINI!!
- Safe And Durable: Unlike traditional plastic seals, DaToo uses a rubber sealing layer, which ensures that DaToo has better sealing and safety performance, and will never leak electricity or water. Quartz glass material, explosion-proof and crack-proof, more sturdy and durable, without worrying about damage.
- One Year Warranty & Satisfaction Guarantee: This heater is ideal for 1 to 6 gallon small glass or acrylic desktop aquariums. When in use, it needs to be submerged 100% in water. We provide one year warranty and 24 hours professional customer service. Buy With Confidence!
Bestseller No. 3
DaToo Aquarium Mini Magnetic Scrubber Scraper Small Fish Tank Cleaner Nano Glass Aquarium Cleaning Tools with Super Strong Magnet
- 【Perfect Mini Aquarium Cleaner】: Still looking for a powerful magnetic aquarium glass cleaner? Then you can't miss the DaToo Mini Aquarium Cleaner with super-strong magnets. Complete and efficient cleaning mode, N38 super strong NdFeB magnet, sturdy and durable, easy to use, let you start showing off your clean aquarium to your friends and family with confidence from today!
- 【Fast And Efficient Cleaning Mode】: DaToo Fish Tank Cleaner has a soft cleaning pad made of high-quality eco-friendly non-woven fabric on one side and an abrasive pad made of special fibers on the other side, ideal for removing all types of dust and stains on your fish tank. No need to get your hands wet, just move the handle outside of the fish tank and you can quickly complete the daily cleaning of aquarium, saving you half of your time!
- 【Super Strong NdFeB Magnet】: For more powerful cleaning ability, DaToo Aquarium Cleaner uses N38 Super Strong NdFeB Magnet as the magnetic material, the magnetic field strength is 2600GS, and the cleaning force is 140N, which makes DaToo has an incredible cleaning strength, and the cleaning ability is 2~3 times more than other similar products. When you use DaToo fish tank cleaner, you will realize what is really strong!
- 【Sturdy And Durable】: High-strength ABS shell, fearless of any external collision or drop, corrosion-resistant. Whether freshwater or saltwater tank, you can use it. Permanent magnetism, N38 NdFeB permanent magnet, durable and long life, the magnetism does not weaken after long time use, giving you consistent cleaning strength!
- 【Easy To Use & One Year Warranty】: 4.5*2.1inch fun mini size, ergonomic handle design, easy to reach the most difficult places of your aquarium, ideal for use in glass tanks up to 8MM (5/16") thick. We provide one year warranty and 24 hours professional customer service. Buy With Confidence!
Bestseller No. 4
Orlushy 25W Small Submersible Aquarium Heater, Constant Temperature Betta Fish Tank Heater of 78℉for 1-6 Gallons Freshwater & Saltwater Tanks
- 【25W Aquarium Heater】Orlushy 25w fish tank heater can be applicable to 1-6 gallons tank. It is 4.7 inches in length, ideal for use in low water level and won’t take up mech place, easy to hide in small tank. Please fully submerged the heater vertically into water in fish tank, and horizontally into water in turtle tanks.
- 【Easy to Operate 】This aquarium heater is automatic constant temperature heating when the power is switched on. The preset temperature is 78℉. Accuracy is ±3℉. Stair shape heating that red light is on and heater starts to intermittently heat the water to the preset temp, saving energy and electricity. When green light is on, heater stops working and maintains constantly 78℉.
- 【Durable & Material】 The durable material of the heater ensures safe operation. The outer shell covering the whole body of the heater is made of heat-resistant ABS material that it won’t deform and melt under high temperature. The heating rod is made of nickel-chromium heating wire to faster heating rate, and non-corrosive quartz glass.
- 【Cautions】 1.Please ensure the heater is 100% submerged into the water before plug in the power. 2. Please unplug the power and cool down the heater for 10-20 minutes before taking it out to clean the fish tanks or change the water.
- 【Guaranteed Customer Service】 Orlushy fish tank heater is made with great safety and durability for use. We guarantee 1 -Year warranty. If there is any issue with our product, please contact us, and we would gladly offer you after-sales service.
Bestseller No. 5
AQUANEAT Fish Tank, 1.2 Gallon Aquarium, Small Betta Fish Tank Starter Kit with LED Light and Water Filter Pump, Rectangular
- Easy to Maintain: The water filtration system reduces the frequency of water changes, which makes it a good choice for aquarium beginners or starters to keep a single Betta, a couple of shrimp, snails, or a small goldfish. Dimension：8”x5.25”x7”(LxWxH)
- Built-in Light: LED hood provides ample light for the tank making your fish glow brighter and the decorations stand out.
- Compact Size: The tank is lightweight, cute and small and it doesn't take up too much space on the desktop or a kitchen counter. (Note: If the current is a bit strong, you can put a pre-filter sponge filter on the intake to reduce the water flow.)
- Complete Starter Kit: 1x 1.2 gallon Fish tank, 1x Sponge, 1x Water Filter, 1x 5V USB Power Cord, 2x Artificial Plants
- Note: No USB power adapter included, the tank needs a power adapter rated ≥ 5V/ 2A. Make sure the adapter you use is powerful enough. Insufficient power of the adapter may cause the light or the pump not working. If the pump stops working or the water flow decreases, it is time to remove the pump, clean it thoroughly, and then properly reinstall the impeller and shaft assembly to restore normal operation. And the pump need to be FULLY SUBMERGED UNDER WATER to work.
Bestseller No. 6
Ameliade Aquarium Artificial Plastic Plants Decorations and Rock Cave Decor Set Goldfish Betta Fish Tank Accessories Small Large Fish Bowl Ornaments
- Ameliade fish tank decorations perfectly replicates the natural environment, and once you put it in the tank, you won't even be able to recognize that it's actually made of plastic. Your fish will enjoy the environment these plants provide，and they can play and hide in it.
- The leaves are soft and lifelike without scratching the fish. They swing with the water waves in the fish tank, making them look very vivid and beautiful in the water. They can be planted in both of freshwater and seawater. Each plant has its own base for holding it in the gravel.
- Unlike live plants in fish tank, plastic artificial plants do not need special lighting and other substrates. They neither die nor become wilted or unattractive. They remain beautiful all the time without any pruning.
- We provide the suitable aquarium products for different sizes of aquariums in order to save you time. You just need to buy them according to your needs and put them in your fish tank, and they will create a beautiful underwater world for your pet fish, making fish life more interesting and happier. This will turn your fish tank into their amusement park.
- The set contains 1 rockery aquarium decoration, 3 short aquarium plants, 3 medium aquarium plants and 1 tall aquarium plants with a total of 8 different styles. Heights vary from 2 inches to 8 inches. It is suitable for 5 gallon or larger fish tanks.
Bestseller No. 7
Tetra 3 Gallon Small Fish Tank, Aquarium Starter Kit, with Filter, Air pump, & Color Changing Light, Half Moon shape, for Gold Fish & Betta
- AQUARIUM KIT: Half-moon shape allows 180-degree panoramic viewing – starter kit has everything you need.
- BUBBLE CURTAIN: Bubbling disc automatically cycles through a rainbow of LED light colors.
- INCLUDES FILTER: Includes air pump-driven Tetra Whisper Internal Power Filter to keep your tank clean and provide a healthy environment for pet fish.
- AIR PUMP: Drives both the bubbling disc and the filter.
- CONVENIENT: Clear canopy has a hole for easy feeding.
Bestseller No. 8
AQUANEAT Aquarium Heater, 25W Small Betta Fish Tank Heater, Mini Preset Water Thermostat with a Thermometer
- Mini Size: The heater is only 4.5” in length making it a great choice for small sized tanks from 3 to 5.5 gallons without taking up much space and obscuring the viewing area.
- Easy to Use: The small 25W aquarium heater is preset to 78°F which is a perfect temp for Betta and most of other tropical fishes, and no extra setup needed just plug and play.
- Easy to Check: The indicator light turns red when it is heating and it turns green when it is resting so it is easier to do a quick check every day.
- Includes: 1x 25W Small Aquarium Heater, 1x Suction Cup, 1x Free Thermometer Strip
- Cautions: Always keep it fully submerged under water before plugged in, and unplug it and wait for at least 10 min before you do aquarium maintenance or take it out of water.
Bestseller No. 9
Tetra Water Cleaner Gravel Siphon for Aquariums, Easily Clean Freshwater Aquariums
- TETRA WATER CLEANER: Gravel siphon used to easily clean aquariums.
- COMPATIBLE AQUARIUM SIZE: For aquariums up to 55 gallons.
- MAKES MONTHLY WATER CHANGES EASY: It only takes 30 minutes to replace 30% of water every 30 days.
- REMOVE DEBRIS: Siphons are a great way to easily remove debris from gravel by moving the water cleaner throughout the gravel.
- INCLUDED: Tetra Water Cleaner comes with gravel siphon, priming bulb and clip for bucket for a simple set up.
Bestseller No. 10
Tetra Bubbling LED Aquarium Kit 1 Gallon, Hexagon Shape, With Color-Changing Light Disc
- Aquarium KIT Hexagon-shaped aquarium kit is perfect for betta fish
- COLORFUL Bubbling disc automatically cycles through a rainbow of LED light colors
- INCLUDES FILTER Includes air pump-driven Tetra Whisper Internal Power Filter to keep your tank clean and provide a healthy environment for pet fish
- AIR PUMP Drives both the bubbling disc and the filter
- CONVENIENT Clear canopy has a hole for easy feeding
Finding the best small fish for small tanks requires understanding the specific needs of various species and how they can cohabitate with one another. This guide will not only highlight the best products but will also include a buying guide to help you make an informed decision.
Buying Guide for Best Small Fish for Small Tank
When selecting the best small fish for a small tank, several factors come into play. Here’s what you need to consider:
1. Tank Size
Most small fish do well in tanks ranging from 5 to 20 gallons. Ensure that the species you choose is suitable for your tank size.
2. Water Parameters
Different fish species have varying requirements regarding pH, temperature, and hardness. Choose fish that can thrive in similar water conditions.
3. Behavior and Compatibility
Some fish are more aggressive than others. Ensure you select species that can coexist peacefully in the same environment.
4. Diet
Different fish have different dietary needs. Make sure you have the right type of food on hand to maintain their health and vibrancy.
5. Care Level
Consider your experience level in fishkeeping. Some species are easier to care for than others and may be perfect for beginners.
Top 10 Best Small Fish for Small Tank
1. Neon Tetra
The Neon Tetra is one of the most famous small fish for aquarists. These tiny, colorful fish are native to the Amazon Basin and are renowned for their brilliant blue and red coloring.
Key Features:
- Size: Up to 1.5 inches
- Tank Size: Minimum 10 gallons
- Behavior: Peaceful and schooling fish
- Diet: Omnivore
Because these fish thrive in schools, it’s advised to keep at least six to create a more natural and stress-free environment.
Bestseller No. 1
6 Neon Tetra (Paracheirodon innesi) Freshwater Aquarium Fish Live (Approx. Size 1.5 cm) (1-2cm, 6, Count)
- Peaceful Nature: These small, non-aggressive fish are perfect for community tanks and get along well with other peaceful species.
- Vibrant Colors: The iridescent blue and striking red stripes of Neon Tetras add an exotic touch to any aquarium setup.
- Peaceful Nature: These small, non-aggressive fish are perfect for community tanks and get along well with other peaceful species.
2. Guppy
Guppies are hardy, colorful fish that are perfect for beginners. They come in various colors and patterns and breed easily, which can add excitement to your tank.
Key Features:
- Size: Approximately 2 inches
- Tank Size: Minimum 5 gallons
- Behavior: Peaceful, can be kept in large groups
- Diet: Herbivore
Guppies thrive in various water conditions, making them an excellent choice for first-time fish owners.
Bestseller No. 1
Ultra Fresh Royal Guppy Mignon Pellet, All Natural Guppy Food, Sword Prawns, Spirulina, Highly Nutritious, for Cleaner Water and More Vibrant Color 1.87 oz
- High Palatability : Our guppy food contains up to 35% of wild sword prawns and all other 100% natural ingredients which make it highly nutritious without sacrificing superior taste—even the pickiest guppy can't resist it!
- Easy to Intake & Digest : As small as 0.6mm granule, it softens quickly, easy for guppy to digest. *Feed 1-3 times per day, no more than your fish can consume within 3 minutes. Don't overfeed your fish
- Ultra Natural Coloration : Ultra-enhanced formulation of natural seaweed, Australian spirulina, and premium fresh sword prawns enhances the natural coloration of your fish, presenting them in their most natural and vibrant colors.
- Healthy Growth Formula : It's not only tasty, but it also keeps guppies healthy! Our food is jam-packed with vitamins (A, C, D3, E, B1, B2, B6, B12) great for reaching full potential in size, color, fins, and A+ immunity!
- 3 Million CFUs/g Probiotics : 3 million CFUs/g probiotics are within our food to automatically help dissolve fish excrements, residuals and keeps water clean. Other than that it helps fish to fully absorb nutrition, help to excretion, enhance the immune system and lower the risk of digestive problems.
3. Betta Fish
Although Betta fish (Siamese fighting fish) can be territorial, they are mesmerizing to watch with their vibrant colors and flowing fins. Keep in mind that male Bettas should not be housed together.
Key Features:
- Size: Up to 3 inches
- Tank Size: Minimum 5 gallons
- Behavior: Territorial, especially males
- Diet: Carnivore
A well-maintained tank with plenty of hiding spots will help reduce stress for your Betta.
Bestseller No. 1
TetraBetta PLUS Floating Mini Pellets, Fish Food With Natural Color Enhancer, 1.2 ounces
- BETTA FORMULATION: Nutritionally balanced diet is an ideal daily staple food for your Siamese fighting fish (betta splendens) and other top-water feeding tropical fish.
- FOR DAILY FEEDING: Premium diet high in protein and omega-3 fatty acids for energy and growth.
- COLOR ENHANCING: Includes natural color enhancers to promote the development of rich, beautiful coloration in your betta fish.
- FLOATING CRISPS: Blend of tiny, colorful floating crisps for top-water feeders.
- CLEAR WATER: Advanced clear water formula helps maintain water clarity.
4. Rasbora
The Rasbora is another small fish known for its peaceful nature and schooling behavior. The most popular species is the Harlequin Rasbora, which has a striking pattern.
Key Features:
- Size: About 2 inches
- Tank Size: Minimum 10 gallons
- Behavior: Peaceful and prefers to be in schools
- Diet: Omnivore
Rasboras are perfect for community tanks and can be paired with similar-sized fish.
Bestseller No. 1
Swimming Creatures™ Most Popular Freshwater Aquarium Fish Collection, Live (6 Galaxy RASBORAS)
- Swimming Creatures 1 Snowflake Pleco & 1 Albino Pleco Shortfin, (Ancistrus dolichopterus 2-4cm) & (L144 Hypancistrus sp. 2-4cm) - Live Aquarium Fish
5. Corydoras Catfish
Corydoras are delightful bottom feeders that help keep the substrate clean. They are social fish that thrive in groups, making them ideal for community tanks.
Key Features:
- Size: About 2-3 inches
- Tank Size: Minimum 10 gallons
- Behavior: Peaceful
- Diet: Omnivore
Corydoras are perfect for both beginners and experienced aquarists.
Bestseller No. 1
Swimming Creatures™ Most Popular Freshwater Aquarium Fish Collection, Live (5 Panda CORYDORAS)
- Swimming Creatures 1 Snowflake Pleco & 1 Albino Pleco Shortfin, (Ancistrus dolichopterus 2-4cm) & (L144 Hypancistrus sp. 2-4cm) - Live Aquarium Fish
6. Endler’s Livebearer
Endler’s livebearers are small, colorful fish that are closely related to guppies. They are easy to care for and reproduce rapidly.
Key Features:
- Size: About 1-1.5 inches
- Tank Size: Minimum 5 gallons
- Behavior: Peaceful, can be kept in groups
- Diet: Omnivore
These fish prefer to live in planted tanks and provide a vibrant addition to community setups.
Bestseller No. 1
Swimming Creatures™ Mixed Endler's Livebearer (Poecilia wingei) Live Tropical Freshwater Aquarium Fish (12 Pack)
- A vibrant mix of 12 male Endler’s Livebearers in assorted colors and patterns. Perfect for community tanks; peaceful, active, and great for nano or planted aquariums. Note: Colors and patterns may vary from the photos. Each pack includes the best available variety from our current premium stock.
- ⦁Due to state regulations, we do not ship to Oregon (OR)
- DOA Coverage: We cover any Dead on Arrival (DOA). Please contact us using the information provided on the package to resolve any issues.
- Care Guide: Temperature: 72–82°F pH: 6.5–8.0 Diet: Omnivore – accepts flakes, pellets, and frozen foods TDS: 200–350 ppm Acclimate slowly; maintain clean, cycled water for best health and color.
7. Zebra Danio
Zebra Danios are small, active fish characterized by their distinctive striped patterns. They are hardy fish that adapt easily to various conditions.
Key Features:
- Size: Up to 2 inches
- Tank Size: Minimum 10 gallons
- Behavior: Active, peaceful
- Diet: Omnivore
Zebra Danios are ideal for beginners and can coexist with many other fish species.
Bestseller No. 1
Zebra Fish (Danios), Living, Female, Pack of 3
- When you shop with Carolina, you're not alone! All of our products are backed by unparalleled technical support, available from 8:00am to 6:00pm, ET, Monday through Friday. Live chat is available from 8am to 5:30pm ET, Monday-Friday. Contact information (Live Chat, email, and phone) is provided after placing your order at Amazon.
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8. Cherry Shrimp
While not a fish, Cherry Shrimp are fantastic additions to small tanks. These invertebrates help maintain algae levels and are entertaining to observe.
Key Features:
- Size: About 1-1.5 inches
- Tank Size: Minimum 5 gallons
- Behavior: Peaceful
- Diet: Omnivore
Cherry Shrimp can coexist well with small fish and contribute to the biodiversity of your aquarium.
Bestseller No. 1
Las Vegas Exotic Fish™ 20 High Grade Fire Red Cherry Shrimps Neocaridina Live Freshwater Shrimp Aquarium Inverts (Live Guarantee or Replacemnt is free) FREE PLANT!
- 20 FIRE RED NEOCARIDINA SHRIMPS
- High Grade
- Size: Juvenile shrimps 1/4" - 1/2" .Healthy and Active.
- Live Guarantee or Replacemnt is free
9. Celestial Pearl Danio
Known for their stunning coloration, Celestial Pearl Danios are small, peaceful fish that do well in community tanks.
Key Features:
- Size: About 1 inch
- Tank Size: Minimum 10 gallons
- Behavior: Peaceful
- Diet: Omnivore
These small fish are perfect for aquarists looking for beauty and tranquility.
Bestseller No. 1
Neat&Tidy Galaxy Rasbora Celestial Pearl Danio Small (16 Fish Pack) - Live Fish for Aquarium Exotic Freshwater Live Fish
- œ Step into a world of wonder with the Celestial Pearl Danio, a nano fish renowned for its peaceful nature and breathtaking beauty. Imagine a celestial scene unfolding in your aquarium as these jewel-toned gems swim gracefully, adorned with shimmering, pearl-like markings reminiscent of a starry galaxy
- œ Witness the magic of the Celestial Pearl Danio as it forms shimmering schools, creating mesmerizing waves of motion that dance through your tank. These fish not only school with each other but also with other danios and rasboras, painting your aquarium with vibrant rainbows of Color
- œ Elevate your aquarium with our tank-raised Celestial Pearl Danios, a rare find in the United States. These juveniles, though initially lacking the dazzling Coloration of adults, promise to transform into exquisite specimens, reminiscent of the iconic Rainbow Fish, as they mature
- œ Enjoy the tranquility of caring for Celestial Pearl Danios, as they thrive in stable water conditions with good quality. These peaceful fish do best in groups of six or more, in tanks adorned with plants, rocks, or driftwood for cover
- œ Our Celestial Pearl Danios, with their stunning Colors and peaceful nature, are sure to be the crowning jewel of your aquatic paradise.
10. Pygmy Corydoras
These small catfish are ideal for those looking for adorable bottom feeders that stay relatively small.
Key Features:
- Size: About 1-1.5 inches
- Tank Size: Minimum 10 gallons
- Behavior: Peaceful
- Diet: Omnivore
Like their larger relatives, Pygmy Corydoras thrive in groups and help keep your tank clean.
Bestseller No. 1
Swimming Creatures™ Pygmy Cory (Corydoras pygmaeus) Freshwater Aquarium Fish Live (6 Pack)
- Beautiful addition to an aquarium.
- Active and Playful: These tiny fish explore all levels of the tank but often enjoy swimming in the middle and lower areas, adding liveliness to your aquarium.
- Compact Size: Reaching only about 1 inch in length, Pygmy Corys are perfect for nano tanks or as part of a larger freshwater setup.
- Soft Substrate Recommended: A soft, sandy substrate is best to protect their delicate barbels during foraging.
- Easy to Care For: Pygmy Corys are adaptable to a wide range of water conditions and make an excellent choice for both beginners and experienced aquarists.
Conclusion
Choosing the best small fish for small tanks is essential for creating a vibrant aquarium. Each species mentioned in this article brings unique characteristics that can enhance your tank’s beauty and ecosystem. Remember always to research the specific care requirements for any species you choose to ensure a healthy tank environment. Based on your preferences, any of these options can provide an enjoyable and colorful aquatic experience. Happy fishkeeping in 2024!
Last update on 2026-03-07 / Affiliate links / Images from Amazon Product Advertising API | hishecozy.com is a participant in the Amazon Associate program and will earn from qualifying purchases.
