Neon Tetra Quick Care Guide

by Kevin

Neon tetra in a planted tank.

Neon tetras are popular tropical fish known for their vibrant colors and peaceful nature. But, they are not always the most hardy fish, and a whole school can crash if an aquarium is not cycled or set up correctly. Properly caring for neon tetras involves understanding their natural habitat, behavior, and dietary needs.

The goal of this guide is to provide you with a quick overview of what it takes to care for neon tetras. If you decide that neon tetras are the right fish for you after reading this guide, I highly recommend doing some additional research on YouTube to see how other aquarists care for these fish.

1. Understanding Neon Tetras

Three neon tetras in a planted aquarium.

Scientific Name: Paracheirodon innesi

Natural Habitat: Amazon basin in South America, in soft, acidic water.

Size: Up to 1.5 inches (3.8 cm) in length.

Lifespan: 5 to 10 years with proper care.

Behavior: Peaceful, schooling fish that thrives in groups.

2. Setting Up an Aquarium for Neon Tetras

Tank Size:

A minimum of 10 gallons is recommended for a small school of neon tetras. Larger tanks, like a 20-gallon long, are recommended as they provide more stable water conditions and space for the fish to swim.

Check out my article on the best aquascaping ideas if you want to get some inspiration for designing a tank for your neon tetras.

Water Parameters:

Temperature: 72°F to 76°F (22°C to 24°C)

pH: 5.0 to 7.0, with a sweet spot around 6.2 to 6.8

Hardness: Soft to slightly hard water, 1 to 10 dGH


A gentle filter is necessary to keep the water clean without creating strong currents, as neon tetras prefer calm waters.

Aeration and Lighting:

Moderate lighting to mimic their natural shaded environments, and a standard air pump for adequate oxygenation.

3. Creating the Right Environment


Soft, dark substrate to mirror their natural habitat and highlight their colors.

Plants and Decor:

Heavily plant the tank with live plants like Java Fern, Anubias, and mosses to provide hiding spots and mimic their natural environment. Driftwood and rocks can also add to the natural aesthetic.


Keep them in groups of at least 6 to 10 individuals to promote natural behavior and reduce stress.

4. Diet and Feeding


Omnivorous. Their diet should include a mix of high-quality flake food, frozen or live foods such as brine shrimp, daphnia, and bloodworms.

Feeding Frequency:

Feed small amounts 2 to 3 times a day, only as much as they can consume in 3 minutes to avoid overfeeding and polluting the water.

5. Health and Maintenance

Regular Maintenance:

Perform 25%-30% water changes weekly to maintain water quality. Test water parameters regularly to ensure they remain within the ideal range.

Common Diseases:

Neon Tetra Disease, fungal infections, and ich. Quarantine any new fish before adding them to the tank and maintain clean water to prevent diseases.

Signs of Good Health:

Active swimming, vibrant colors, and a good appetite.

6. Compatibility

Tank Mates:

Choose peaceful fish of similar size. Good companions include other small tetras, rasboras, and dwarf gouramis. Avoid larger, aggressive fish that may bully or eat them (Betta fish can work because they are usually slower swimmers, but monitor the situation to avoid stressing your neons).

7. Breeding

Breeding neon tetras can be challenging. It requires a separate breeding tank with soft, acidic water. Spawning is triggered by water changes and mimicking rainy season conditions. Eggs are laid among plants and should be removed to a separate tank to hatch to avoid being eaten by adult fish.

8. Advanced Care Tips

Seasonal Adjustments:

Be mindful of seasonal changes that might affect tank conditions, such as temperature fluctuations. To avoid temperature swings, provide a quality heater throughout the year. For the exceptionally warm months, use a fan to create evaporative cooling, which will help keep the temperature from rising too high.

Stress Reduction:

Neon tetras are very anxious fish (in my experience). Minimize stress by avoiding frequent decor changes in the tank, maintaining a routine for lights on/off, and using a cover to reduce external disturbances. Stress can make neon tetras more susceptible to diseases.


Having a water test kit and treatments for common diseases on hand is vital and will allow you to treat your fish right away, which is often the difference between losing a fish and saving a fish.

Engage with the Aquarium Community:

Joining fish keeping forums, social media groups, or local aquarium societies can provide support, advanced tips, and camaraderie. Sharing experiences and challenges with other enthusiasts can enhance your knowledge and enjoyment of keeping neon tetras. Also, YouTube has a wealth of knowledge about keeping neon tetras, and it’s helpful to see how other aquarists are keeping these amazing fish.

9. Common Mistakes to Avoid


While neon tetras thrive in groups, overcrowding can lead to poor water quality and increased stress, making fish more prone to disease.


This is a common issue that can lead to water pollution and health problems. Ensure all food is consumed within a few minutes, and remove any uneaten food.

Ignoring Quarantine:

Introducing new fish without a quarantine period is a common way diseases are introduced to a tank. Always quarantine new arrivals for 2-3 weeks.

Neglecting Water Changes:

Regular water changes are crucial for removing toxins and maintaining stable water parameters. Neglecting this can lead to harmful buildup and stress your fish.


Caring for neon tetras is a rewarding experience that requires attention to detail and commitment to their well-being. By creating a stable, healthy environment and monitoring their behavior and health, you can enjoy the beauty and tranquility that these small fish bring to your aquarium for many years.

If you enjoyed this article and are planning to set up a new tank, check out my post on the ideal fish for a 10-gallon tank for some inspiration.

As always, stay zen.