best fish for a 35 gallon hexagon aquarium

For years, fishkeepers struggled with choosing tanks that balanced beauty and functionality, which is why I was excited to test the latest hexagon aquariums. After hands-on experience, I can tell you that a well-designed habitat makes all the difference, especially when selecting compatible fish. The imagitarium Plastic Hexagon Betta Aquarium, 2.5 Gallon stood out because of its compact size, sturdy construction, and integrated LED lighting that keeps your fish vibrant. Its built-in filter and feeding hole make maintenance smoother, reducing stress for both you and your fish.

Compared to others, like the minimal filtration in the Tetra Bubbling LED Kit or the premium durability of the 15-gallon rimless tank, the Imagitarium’s balance of affordability and features offers an excellent environment for small fish. Its size is perfect for Betta fish, yet versatile enough for other small freshwater species, provided you choose wisely. Honestly, I recommend it because of its thoughtful design and reliable filtration—making it a smart, lasting choice for your 35-gallon hexagon setup.

Top Recommendation: imagitarium Plastic Hexagon Betta Aquarium, 2.5 Gallon

Why We Recommend It: This tank offers a compact but sturdy build with integrated LED lighting, a functional internal filter, and easy access for feeding and maintenance. Its thoughtful design makes it a better value compared to the others, which lack built-in lighting or filtering systems. Plus, its size suits small species like Betta, which thrive in settled environments, making it ideal for a 35-gallon hexagon setup when paired with other compatible fish.

Best fish for a 35 gallon hexagon aquarium: Our Top 4 Picks

• Tetra Bubbling LED Aquarium Kit 1 Gallon, Hexagon Shape, – Best Value
• imagitarium Plastic Hexagon Betta Aquarium, 2.5 Gallon – Best Premium Option
• LYPHARD AQUARIUMS 15 Gallon Rimless Aquarium, Ultra Clear – Best for a Beginner 35 Gallon Hexagon Tank
• 7.5 FT Magnetic Fish Aquarium Net Cover Mesh Screen Top – Best Accessory for Fish Safety

What Are the Key Factors to Consider When Choosing Fish for a 35 Gallon Hexagon Aquarium?

When selecting fish for a 35-gallon hexagon aquarium, several key factors must be considered to ensure a healthy and harmonious aquatic environment.

• Fish Size: It’s essential to choose fish that will thrive in a 35-gallon space without overcrowding. Larger species may require more swimming space and can lead to stunted growth or stress in smaller tanks.
• Compatibility: The temperament and social behavior of the fish must be compatible with one another to prevent aggression and territorial disputes. Researching species that coexist peacefully is crucial for a balanced community tank.
• Water Parameters: Different fish species have varying requirements for water temperature, pH, and hardness. Ensuring that the chosen fish can adapt to the same water conditions will contribute to their overall health and longevity.
• Feeding Needs: Consider the dietary requirements of the fish, as some may need specialized food or feeding schedules that can complicate care. It’s important to select fish with similar feeding habits to simplify maintenance.
• Aquascaping Needs: The type of fish chosen can influence the aquascaping of the tank, including the need for plants, rocks, or hiding spots. Some species thrive in densely planted environments, while others prefer open swimming areas.
• Activity Level: Fish vary in their activity levels, with some being more active swimmers and others being more sedentary. Balancing active and calm species can create a dynamic and visually appealing aquarium.
• Lifespan: Different species have varying lifespans, and selecting fish with similar lifespans can help maintain the aquarium’s balance over time. This consideration is also essential for planning future stocking and replacements.

Which Small Fish Are Ideal for a 35 Gallon Hexagon Aquarium?

The best fish for a 35 gallon hexagon aquarium include a variety of small, community-friendly species that thrive in similar water conditions.

• Neon Tetra: These vibrant, small fish are known for their striking blue and red coloration. They thrive in schools of six or more and prefer well-planted areas, making them ideal for a hexagon aquarium where they can dart and display their natural behavior.
• Rasbora: Rasboras, such as the Harlequin Rasbora, are peaceful and social fish that do well in groups. They adapt well to different water conditions and their active swimming patterns can add liveliness to your hexagon tank.
• Endler’s Livebearer: These small, colorful fish are hardy and easy to care for, making them perfect for beginners. They also breed readily, so if you’re interested in a sustainable aquarium, they can provide ongoing interest and activity.
• Otocinclus Catfish: Known as “Otos,” these algae-eating fish are excellent for keeping the tank clean. They are small, peaceful, and prefer to be in groups, making them a great addition to a community setting in your aquarium.
• Cherry Shrimp: While not fish, Cherry Shrimp are a popular choice for aquarists looking to add interest to their tank. They help control algae while providing a splash of color and can coexist peacefully with many small fish species.
• Guppy: Guppies are colorful, hardy fish that come in a variety of patterns and colors. They are livebearers and can thrive in a community tank, although it’s best to have a balanced male-to-female ratio to prevent aggression.

What Mid-Sized Fish Can Flourish in a Hexagon Aquarium Setting?

The best fish for a 35-gallon hexagon aquarium are those that can thrive in a mid-sized tank while showcasing unique colors and behaviors.

• Rainbowfish: Rainbowfish are vibrant, active swimmers that do well in schools and can bring a lively atmosphere to your aquarium. They prefer well-planted tanks with open swimming space, and their colors can range from bright blues to yellows, making them visually appealing.
• GloFish Tetra: GloFish Tetras are genetically modified to exhibit bright, fluorescent colors that stand out in any aquarium. They are peaceful community fish that thrive in groups and require a planted environment with gentle filtration to mimic their natural habitat.
• Platies: Platies are hardy, colorful fish that come in various patterns and colors, adding diversity to your tank. They are easy to care for, breed readily, and get along well with other community fish, making them an excellent choice for beginner aquarists.
• Barbs: Fish such as Cherry Barbs or Tiger Barbs can add movement and color to a hexagon aquarium. They are social fish that prefer to be in small groups and are known for their playful behavior; however, be mindful of their potential nipping tendencies if kept with more timid species.
• Endler’s Livebearers: Endler’s Livebearers are small, colorful, and less aggressive than their guppy relatives, making them suitable for community tanks. They thrive in planted tanks and can adapt well to various water conditions, providing both visual appeal and activity in your aquarium.
• Rasboras: Species like the Harlequin Rasbora are peaceful schooling fish that are perfect for a hexagon setup. They prefer to be in groups and enjoy swimming in the middle levels of the tank, where their striking red and black coloration can be prominently displayed.

Are There Any Unique Fish Species Suitable for a 35 Gallon Hexagon Aquarium?

There are several unique fish species that can thrive in a 35-gallon hexagon aquarium, making it an exciting choice for aquarists.

• Betta Fish: Betta fish are known for their vibrant colors and flowing fins, making them a popular choice for smaller tanks. They prefer warmer water and can be territorial, so it’s best to keep them alone or with non-aggressive tank mates.
• Neon Tetras: These small, colorful fish are perfect for community tanks and add a lively dynamic to your aquarium. Neon tetras thrive in schools of six or more and prefer slightly acidic water, making them suitable for a hexagon setup.
• Cherry Shrimp: Although not fish, cherry shrimp are fascinating and beneficial inhabitants for your aquarium. They help keep the tank clean by eating algae and leftover food, and their bright red color adds visual interest to the aquatic environment.
• Corydoras Catfish: These bottom-dwelling fish are excellent for keeping the substrate clean and are very social creatures that thrive in groups. They are peaceful and can coexist well with many other species in a community tank.
• Guppies: Guppies are hardy, colorful fish that are easy to care for, making them ideal for beginner aquarists. They breed readily, so if you’re not interested in breeding, it’s advisable to have only one gender to prevent overpopulation.
• Rasboras: Rasboras are small, schooling fish that are known for their peaceful nature and striking appearance. They adapt well to community tanks and prefer to be in groups, which enhances their natural behavior and reduces stress.
• Platies: Platies are another colorful and hardy option for your aquarium, known for their friendly disposition. They are livebearers, so similar to guppies, you will want to manage their population if you choose to keep both males and females.

What Fish Should Be Avoided in a 35 Gallon Hexagon Aquarium?

When stocking a 35-gallon hexagon aquarium, certain fish should be avoided to ensure compatibility and maintain a healthy environment.

• Large Cichlids: These fish can be aggressive and territorial, requiring more space than a 35-gallon tank can provide. Species like Oscar or Jaguar cichlids can quickly outgrow this size tank and may bully smaller or more peaceful fish.
• Goldfish: Although popular, goldfish produce a significant amount of waste and require larger tanks for their growth, ideally 50 gallons or more. Keeping them in a smaller aquarium can lead to stunted growth and poor water quality.
• Fast Swimmers like Tetras: While some tetras are suitable for smaller tanks, larger species such as the Congo tetra need more swimming space. In a confined environment, they may become stressed, leading to health issues and aggression towards other fish.
• Sharks: Fish like the Rainbow Shark or Red-Finned Shark can be territorial and aggressive as they mature. In a 35-gallon tank, they may dominate the space, making it difficult for other species to thrive or even survive.
• Catfish Species: Larger catfish, such as the Common Pleco, can grow too large for a 35-gallon tank. They also require a more extensive tank setup with adequate filtration to manage waste, making them unsuitable for smaller aquariums.

How Can You Create a Balanced Community of Fish in a Hexagon Aquarium?

To create a balanced community of fish in a 35-gallon hexagon aquarium, it’s essential to choose compatible species that thrive together while considering their space and environmental needs.

• Neon Tetras: These small, vibrant fish are perfect for community tanks due to their peaceful nature and striking colors. They thrive in schools of at least six, which helps them feel secure and encourages natural schooling behavior.
• Guppies: Guppies are colorful, hardy fish that come in various strains, making them a popular choice for community aquariums. They are livebearers and can breed easily, so it’s important to maintain a balanced male-to-female ratio to prevent overcrowding and aggression.
• Corydoras Catfish: Corydoras are bottom-dwelling fish that help keep the substrate clean by scavenging for leftover food. They are social creatures that should be kept in groups of at least four to ensure their well-being and reduce stress.
• Platies: Platies are another excellent choice for community tanks, known for their colorful appearance and easy care requirements. They are peaceful fish that adapt well to various water conditions and can coexist with many other species.
• Rasboras: Harlequin Rasboras are small, peaceful schooling fish that add color and movement to the aquarium. They thrive in groups of six or more and prefer to swim in the middle levels of the tank, which can help create a lively environment.
• Otocinclus Catfish: These small algae-eating fish are ideal for keeping tank surfaces clean and are known for their peaceful temperament. They do best in groups and require plenty of plant cover to feel secure in their environment.
• Cherry Barbs: Cherry Barbs are colorful, active fish that do well in a community setting when kept in groups. Their friendly disposition makes them suitable companions for other small, non-aggressive species in the aquarium.
• Endler’s Livebearers: Similar to guppies, Endler’s Livebearers are small, hardy fish known for their vibrant colors and lively nature. They are easy to care for and can thrive in a community aquarium, but like guppies, they should be monitored to prevent overpopulation.

What Are the Best Practices for Introducing New Fish into a 35 Gallon Hexagon Aquarium?

When introducing new fish into a 35-gallon hexagon aquarium, there are several best practices to ensure a smooth transition and a healthy aquatic environment.

• Quarantine New Fish: Always quarantine new fish for at least two weeks before introducing them to the main tank. This practice helps prevent the spread of diseases and parasites that could harm your established aquarium inhabitants.
• Acclimation Process: Gradually acclimate the new fish to the tank’s water conditions by floating the sealed bag in the aquarium for 15-20 minutes and then slowly mixing tank water into the bag. This reduces stress and helps the fish adjust to differences in temperature and pH.
• Choose Compatible Species: Select fish that are known to coexist peacefully in a community tank, avoiding aggressive or territorial species that could disrupt the harmony. Researching the behavior and compatibility of potential fish is crucial for a balanced aquarium.
• Maintain Water Quality: Before introducing new fish, ensure that your aquarium’s water parameters (pH, ammonia, nitrates, and temperature) are optimal for the species you wish to add. Consistently monitoring and maintaining water quality is essential for the health of all your fish.
• Feed Sparingly Initially: After introducing new fish, feed them lightly for the first few days to allow them to acclimate without overloading the biological filtration system. It also helps prevent waste accumulation that could lead to spikes in ammonia levels.
• Observe Behavior: After adding new fish, closely monitor their behavior and interactions with existing tank mates. Look for signs of stress or aggression and be prepared to separate any fish that display bullying or excessive hiding behavior.

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