Best Fish For Small Tanks (With Pics!)
Small aquariums can be a delightful and manageable way to enjoy the beauty and serenity of aquatic life. Whether you're a beginner stepping into the world of fishkeeping or an experienced hobbyist looking to create a compact aquatic oasis, choosing the right fish is crucial. The best fish for small tanks are not only visually stunning but also easy to care for, making them perfect companions for these cozy underwater environments.
Setting up a small aquarium can be a rewarding experience, especially if you choose the right fish species. Small tanks, typically ranging from 5 to 20 gallons, require careful selection of fish that are not only visually appealing but also suitable for the limited space.
In this guide, we'll explore the top 10 fish species that thrive in small tanks, offering a range of vibrant colors, intriguing behaviors, and unique characteristics. From the graceful Betta to the energetic Zebra Danio, these fish will bring life and vibrancy to your aquarium. They create a captivating aquatic display in any space. Read more details as we dive into the enchanting world of small tank fish, where every fin flick and bubble adds a touch of magic to your home.
Table of Contents
- 1. Betta Fish (Betta splendens)
- 2. Neon Tetra (Paracheirodon innesi)
- 3. Guppy (Poecilia reticulata)
- 4. Harlequin Rasbora (Trigonostigma heteromorpha)
- 5. Dwarf Gourami (Trichogaster lalius)
- 6. Cherry Barb (Puntius titteya)
- 7. White Cloud Mountain Minnow (Tanichthys albonubes)
- 8. Pea Puffer (Carinotetraodon travancoricus)
- 9. Sparkling Gourami (Trichopsis pumila)
- 10. Otocinclus Catfish (Otocinclus sp.)
- FAQs
1. Betta Fish (Betta splendens)
Overview:
Betta fish are popular for their striking colors and long, flowing fins. They are a favorite among fish enthusiasts. Originating from Southeast Asia, they are often seen as solitary fish due to their aggressive nature, especially males.
Betta fish have a unique labyrinth organ, allowing them to breathe atmospheric air, which makes them adaptable to various water conditions. They come in a wide range of colors and fin types, from veiltail to crowntail, making them a stunning centerpiece in small tanks.
Size: Up to 3 inches Temperament: Males are aggressive towards each other; best kept alone or with non-fin-nipping tank mates. Care Requirements: Betta fish require warm water (78-82°F) and a gentle filter. They can breathe atmospheric air due to their labyrinth organ.
2. Neon Tetra (Paracheirodon innesi)

Size: Up to 1.5 inches Temperament: Peaceful and social; should be kept in groups of six or more. Care Requirements: Neon Tetras thrive in water temperatures between 70-81°F and prefer a well-planted tank with subdued lighting.
3. Guppy (Poecilia reticulata)

Size: Up to 2.5 inches Temperament: Peaceful; males may sometimes chase females, so a ratio of one male to two or three females is recommended. Care Requirements: Guppies prefer water temperatures between 72-82°F. They are hardy and adapt well to different water conditions.
4. Harlequin Rasbora (Trigonostigma heteromorpha)

Size: Up to 2 inches Temperament: Peaceful; best kept in groups of six or more. Care Requirements: They thrive in water temperatures between 72-81°F and prefer a well-planted tank.
5. Dwarf Gourami (Trichogaster lalius)

Size: Up to 3.5 inches Temperament: Generally peaceful, but males can be territorial. Care Requirements: Dwarf Gouramis prefer water temperatures between 77-82°F and appreciate a well-planted tank with hiding spots.
6. Cherry Barb (Puntius titteya)

Size: Up to 2 inches Temperament: Peaceful; best kept in groups of five or more. Care Requirements: They prefer water temperatures between 73-81°F and enjoy a planted tank environment.
7. White Cloud Mountain Minnow (Tanichthys albonubes)

Size: Up to 1.5 inches Temperament: Peaceful; best kept in groups of six or more. Care Requirements: They thrive in cooler water temperatures between 64-72°F and do well in a variety of tank setups.
8. Pea Puffer (Carinotetraodon travancoricus)

Size: Up to 1 inch Temperament: Can be territorial; best kept alone or in a well-monitored group. Care Requirements: They prefer water temperatures between 74-82°F and require a diet of small, live or frozen foods.
9. Sparkling Gourami (Trichopsis pumila)

Size: Up to 1.5 inches Temperament: Peaceful; best kept in a quiet community tank. Care Requirements: They thrive in water temperatures between 77-82°F and prefer a well-planted tank with hiding spots.
10. Otocinclus Catfish (Otocinclus sp.)

Size: Up to 2 inches Temperament: Peaceful; best kept in groups. Care Requirements: They prefer water temperatures between 72-78°F and need a well-oxygenated tank with plenty of algae to graze on.
Frequently Asked Questions (FAQs)
1. What size aquarium is best for small fish?
The best aquarium size for small fish generally ranges from 5 to 20 gallons. This provides ample space for swimming and reduces stress among fish.
2. How often should I feed my small aquarium fish?
Small aquarium fish should be fed 1-2 times a day, offering only what they can consume in a few minutes to prevent overfeeding and water quality issues.
3. Can I mix different species of small fish in the same tank?
Yes, many small fish species can coexist peacefully in the same tank. However, it's important to research compatibility and avoid aggressive species.
4. What are the ideal water conditions for small aquarium fish?
Most small aquarium fish thrive in temperatures between 72-82°F with a pH level of 6.5-7.5. Always check specific needs for each species.
5. How do I maintain water quality in a small aquarium?
Regular water changes (10-20% weekly), using a good filtration system, and monitoring parameters like pH and ammonia levels are key to maintaining water quality.