10 Best Fish For 1-gallon Aquariums [2025]
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Finding the best fish for 1-gallon aquariums can be a daunting task, especially with the myriad of options available, making it challenging to determine which species will thrive in such a limited space. To simplify your search, we meticulously shortlisted 10 fish that are not only suitable for 1-gallon tanks but also meet various criteria such as size, temperament, and care requirements. Our curated list is designed to save you time and hassle, enabling you to make an informed choice quickly and enjoy a vibrant aquatic environment in your small aquarium.
Top 10 Fish For 1-gallon Aquariums In The Market
Fish For 1-gallon Aquariums Review
- 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
- 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).
- 【Beta Fish Tank Aautomatic Cleaning】Ideal for starters and saving your time, add freshwater with similar temperatures every day to achieve cleaning and oxygenation. Easy to set up, and easy to maintain.
- 【Dazzling Colors】 Automatic switching LED lighting with 7 dazzling color choices to brightly illuminate your fish. Uses 2pcs CR2032 button cells (not included)，available on Amazon.
- 【360 fish bowl】 Transparency is so good that most think it's glass, constructed of impact-resistant plastic providing leak-proof assurance.
- 【Dimensions】 6.5 DIA x 9.5 H Inches.
- 【The Best Choosing】: This mini fish tank is the greatest choosing that you can send to your kids, classmates, friends, colleagues, and family for festival days or birthday parties. Full customer satisfaction, 30 days money-back. If you have any questions, we promise to resolve the problem within 24 hours.
- FOR 4 GALLON aquariums: This Whisper Internal Power Filter uses small filter cartridges and adjusts easily to high or low water levels.
- 27 GPH PUMP: The internal 27 GPH pump cycles a 4 gallon aquarium more than 6 times per hour.
- TWO FILTERS IN ONE: Cartridge floss catches debris and fish waste, while Ultra-Activated carbon removes odors and discoloration.
- SPACE-SAVING DESIGN: Your aquarium can be flush to the wall with the internal filter designed to clip on your tank wall and be hidden by décor.
- EVERYTHING YOU NEED IS INCLUDED: This pack contains the hinged lid, tank clip, internal filter and filter cartridge.
- 【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.
- 【Advanced 3-in-1 Water Pump System】 The aquarium's 3-in-1 pump combines water circulation, oxygenation and filtration in one smart system, ensuring crystal-clear water and optimal fish health with just one switch. The pump also features dual operating modes to suit different needs: the energy-saving intermittent mode provides a gentle, natural current that keeps fish stress-free, while the powerful continuous mode delivers maximum oxygenation - perfect for keeping demanding fish like goldfish and koi happy and healthy.
- 【Smart LED Lighting for Stunning Ambiance】 The fish tank features a 6-color LED lighting system, supporting single-color modes (red/blue/green) or dynamic mixed modes (red & blue/red & green/5-color rotation), creating a dreamy underwater ambiance.
- 【Ready-to-Use & Hassle-Free Setup】 The set includes artificial seaweed + colored pebbles + spare filter cotton + USB cable—no extra purchases needed, allowing you to easily create a mini underwater world. Powered by USB, it’s compatible with power banks, laptops, or wall outlets for hassle-free use anywhere, eliminating complex setup.
- 【Safety & Eco-Friendly Features】 The square aquarium features smooth, rounded edges with no sharp corners for safety, making it ideal for families with children or pets. The waterproof LED lighting is top-mounted for durability and to prevent electrical hazards. The reusable filter sponge reduces material costs and replacement frequency, offering an eco-friendly and economical solution.
- 【Immersive Ocean Experience】 Features a built-in realistic ocean background to enhance visual depth, making even a small space feel like a vast underwater world.You can also Pair it with other decorations to create your own unique dream aquarium.
- DaToo AQUARIUM FILTER: How to create a clean and healthy environment for our beloved fish? This is a concern for everyone who likes fish farming. But DaToo filter help you easily implement it. Strong horse-power, Waterfall type water flow, perfect work in 24 hours ensures a clean and healthy water environment. Now follow me to get to know DaToo Aquarium Filter. Let's Go!!
- POWERFUL FILTERING: In the process of raising fish, due to feeding and fish excretion, our fish tank will inevitably produce some harmful impurities and odor. DaToo Filter uses enhanced filter Cartridge with activated carbon, can effectively absorb harmful impurities in the water and remove odors from the tank. Large filter space, extra filter materials can be added as needed, such as biochemical ball, carbon bag, etc. Filtration capacity than similar products increased by 2 to 3 times.
- ULTRA-QUIET: Humans need a good night's sleep, and so are fish. Noise can make fish irritable and even sick. But if you choose DaToo you don't have to worry about this.Ultra-quiet motor, multiple noise reduction designs ensure that DaToo offers you and your fish a quiet and comfortable night. Select DaToo Filter, Let us say goodbye to noise。
- BPA-Free AND ENERGY SAVING: A safe and healthy material is crucial to the health of fish. Every component of the DaToo Aquarium Filter is made with High-quality, Sturdy, BPA-free plastic. Long-term use does not produce toxins, safe for you and your lovely fish. Super energy efficient design, only consume 2KWH of electricity per month.Select DaToo Aquarium Filter, not only cares for your fish health, but also saves your electricity bill.
- FIT: Suitable aquarium tank is 1 Gallon~10 Gallon and will function in as little as 1.5 inches of water -- making DaToo Aquarium Filter not only suitable for fish tank but also for turtle tank and can creat a waterfall inside the tank.（Note: Please ensure that the water level exceeds the inlet）
- 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.
- FAMILY ENJOYMENT - Owning an aquarium can be a really fun and rewarding experience while providing many wellness benefits such stress relief, sleeping better at night and better productivity at work.
- DAZZLING COLORS - Energy-efficient LED lighting offers 7 dazzling color choices to brighten up your fish bowl. Select from daylight white, blue, green, amber, aqua, purple, or red to create the perfect ambiance for your aquatic friends.
- BUILT-IN TIMER - Enjoy the convenience of a built-in light timer. Set your LED light to turn on automatically at the same time every day. The timer feature allows you to choose between light settings of 2 Hours, 4 Hours, or Continuous On with a simple flick of your finger.
- DURABLE CONSTRUCTION - Crafted from impact-resistant plastic, this aquarium boasts crystal-clear clarity that rivals glass. Its construction ensures superior strength and durability, eliminating worries about leaks common in fish bowls with glued silicone seams. This trendy desktop fish tank design offers both style and peace of mind.
- EXPERIENCE LEVEL - Quick and easy to set up and maintain, ideal for beginner to advanced. This stylish 1 gallon fish bowl will enhance any space it occupies. With dimensions of 8"L x 8"W x 9"H, it's compact yet spacious enough to provide a comfortable habitat for fish.
- Ultum Nature Systems rimless aquariums are a staple within the aquascaping community – Our tanks are designed using the golden ratio while keeping a minimalist appearance in mind, combined with the increased clarity of ultra clear glass, they are aesthetically pleasing in any room.
- Crafted with low iron 91% clarity glass and 45-degree corners – The glass appears clearer with a minimal greenish or blue tint with uninterrupted edges, providing a more true-to-life representation of your aquatic environment.
- Constructed with German made silicone – Bonded together using high quality adhesive rated for moisture and durability, our tanks give peace-of-mind for even the most dedicated aquarium enthusiasts.
- Leveling mat included – Leveling mats add a non-slip surface to the base of your tank and are a necessity for adding support and stability for keeping your tank safe and secure from shifting or slipping.
- 16C - 6.29" x 6.29" x 6.29"
Our Review Process
To ensure you get reliable product recommendations, we follow a detailed review methodology that includes:
- Market Research: Scanning best-selling and trending products in this category.
- User Feedback: Reviewing customer reviews, star ratings, and complaints.
- Hands-On Testing: Trying select products ourselves when feasible.
- Feature Comparison: Evaluating specs, durability, pricing, and safety.
- Expert Opinions: Consulting with niche experts or credible reviewers.
We independently select the top 10 options based on value, quality, and usability. To learn more, visit our detailed review process.
Key Considerations Before Buying Fish for 1-Gallon Aquariums
1. Tank Size Limitations
One of the most critical factors to consider before selecting fish for a 1-gallon aquarium is the size limitation of the tank. With only one gallon of water, the capacity for fish is extremely limited. It is essential to choose small, hardy species that can thrive in a confined space. Overcrowding can lead to poor water quality and increased stress levels for the fish.
2. Water Quality Management
Maintaining water quality in a 1-gallon tank can be challenging. Fish produce waste, which can quickly accumulate and lead to toxic conditions. Regular water changes and monitoring of parameters such as pH, ammonia, nitrite, and nitrate levels are necessary. It is crucial to consider fish that are tolerant of fluctuating water conditions, as the small tank volume makes stability harder to achieve.
3. Fish Compatibility
When selecting fish for a small aquarium, compatibility is an important consideration. Many fish species are territorial or aggressive, which can lead to conflict in a confined environment. Researching the behavior and temperament of potential fish species is essential to ensure a peaceful community. Opt for peaceful nano fish that can coexist harmoniously.
4. Filtration and Aeration Needs
Due to the limited water volume, effective filtration and aeration are vital in a 1-gallon aquarium. A strong filter can help maintain water quality, but it must be suitable for the size of the tank to avoid creating strong currents that could stress the fish. Additionally, consider whether the fish will require aeration and choose a filter that provides adequate oxygenation without overwhelming the inhabitants.
5. Feeding and Care Requirements
Different fish species have varying dietary needs, which should be considered before making a purchase. In a small tank, overfeeding can quickly lead to water quality issues. Opt for fish that have simple feeding requirements and can thrive on high-quality flake or pellet food. It’s also essential to consider the time commitment needed for daily feeding and maintenance.
6. Long-Term Commitment
Before acquiring fish for a 1-gallon aquarium, it’s important to understand that keeping fish is a long-term commitment. Many fish species can live for several years, and their care will require ongoing attention. Ensure you are prepared for the responsibilities involved in maintaining an aquarium, including regular cleaning, water testing, and potential upgrades to the tank as the fish grow or if you decide to expand your aquatic community.
FAQs
What types of fish are suitable for a 1-gallon aquarium?
In a 1-gallon aquarium, it’s best to keep small, hardy fish such as Betta fish, small guppies, or a single shrimp. It’s important to avoid overcrowding, as this can lead to poor water quality and stress for the fish.
How often should I change the water in a 1-gallon aquarium?
For a 1-gallon aquarium, it’s recommended to change about 25-50% of the water weekly. Regular water changes help maintain water quality and reduce harmful toxins.
Can I keep more than one fish in a 1-gallon aquarium?
It’s generally not advisable to keep more than one fish in a 1-gallon aquarium due to the limited space and potential for poor water quality. A single Betta fish is often the best choice, while additional small invertebrates like shrimp can sometimes be added.
What type of filtration is best for a 1-gallon aquarium?
A small sponge filter or a low-flow internal filter is usually ideal for a 1-gallon aquarium. These types of filters provide adequate filtration without creating strong currents that could stress the fish.
Do I need a heater for my 1-gallon aquarium?
Whether you need a heater depends on the type of fish you have. Betta fish, for example, thrive in warmer water (around 75-80°F), so a small heater may be necessary. Always monitor water temperature to ensure it’s suitable for your fish.
What plants can I add to a 1-gallon aquarium?
Low-maintenance aquatic plants like Java moss, Anubias, or small water sprites are great options for a 1-gallon aquarium. They help improve water quality and provide hiding spots for fish or shrimp.
How can I maintain good water quality in a 1-gallon aquarium?
To maintain good water quality, perform regular water changes, avoid overfeeding, and monitor water parameters (pH, ammonia, nitrite, and nitrate levels). Using a water conditioner can also help remove harmful chemicals from tap water.
What should I feed fish in a 1-gallon aquarium?
Feed your fish a high-quality pellet or flake food designed for their specific species. Offer small amounts once or twice a day, and be mindful not to overfeed, as uneaten food can pollute the water quickly.
How can I prevent algae growth in a 1-gallon aquarium?
To prevent algae growth, avoid excessive light exposure (12 hours a day is usually sufficient), maintain good water quality, and consider adding algae-eating shrimp or snails. Regular cleaning and water changes also help control algae buildup.
Is a 1-gallon aquarium suitable for beginners?
A 1-gallon aquarium can be a good starting point for beginners, but it requires diligent maintenance due to its small size. It’s crucial to regularly monitor water quality and be mindful of stocking levels to ensure a healthy environment for the fish.
The Bottom Line
In conclusion, selecting the right fish for a 1-gallon aquarium can be a daunting task due to the limited space and strict water quality requirements. However, the ten fish we have highlighted in this article represent some of the best choices for such small environments. We carefully curated this list based on several factors including fish size, temperament, and adaptability to small tanks, ensuring that each species can thrive in a 1-gallon setup. Additionally, we considered the availability of these fish in the market and their general care needs, making it easier for enthusiasts of all experience levels to make informed decisions.
By following our list, you can ensure a healthier and more enjoyable aquarium experience. Choosing the right fish not only enhances the beauty of your tank but also contributes to a balanced ecosystem that can be easier to maintain. Whether you’re a beginner or a seasoned aquarist, these ten fish serve as a reliable guide for creating a vibrant aquatic habitat. Remember to always research individual care requirements and monitor water quality regularly to keep your fish happy and healthy in their compact home.
