Chili Rasbora: Care, Tank Setup, and Compatibility

The Chili Rasbora (Boraras brigittae) is a tiny, vibrant freshwater fish that has captured the hearts of aquarists worldwide. Known for their striking red coloration and peaceful nature, these fish are a popular choice for nano aquariums. If you’re considering adding Chili Rasboras to your tank, this guide will cover everything you need to know, including their care, tank requirements, breeding, and compatibility with other fish. Whether you’re a beginner or an experienced aquarist, this article will help you create the perfect environment for these stunning fish.

Chili Rasboras are native to the blackwater streams of Borneo, where they thrive in soft, acidic water filled with tannins from decaying plant matter. Their small size and schooling behavior make them ideal for aquariums as small as 5 gallons. However, their care requires attention to detail, especially when it comes to water parameters and tank mates. In this guide, we’ll also explore whether different types of Chili Rasboras will school together, how they compare to similar species like the Phoenix Rasbora, and tips for breeding them successfully.

If you’re wondering whether Chili Rasboras are the right fish for your tank, keep reading. We’ll break down their size, temperature preferences, tank size requirements, and more. By the end of this article, you’ll have all the information you need to provide the best care for these beautiful fish.

Chili Rasbora Size and Appearance

Chili Rasboras are among the smallest freshwater fish available in the aquarium hobby. They grow to a maximum size of about 0.6 to 0.8 inches (1.5 to 2 cm), making them perfect for nano tanks. Their vibrant red bodies are accented by a black stripe running from their head to their tail, with subtle hints of orange and gold. Males tend to have brighter colors, especially during breeding, while females are slightly larger and have a rounder belly.

Their small size and striking colors make them a centerpiece in any nano aquarium. However, their diminutive stature also means they can be easily outcompeted for food or stressed by larger, more aggressive tank mates.

Chili Rasbora Care: Water Parameters and Tank Setup

Caring for Chili Rasboras requires maintaining stable water conditions that mimic their natural habitat. These fish thrive in soft, acidic water with the following parameters:

• Temperature: 72–82°F (22–28°C)
• pH: 4.0–7.0 (ideal range is 5.0–6.5)
• Hardness: 1–5 dGH

To replicate their blackwater environment, consider adding driftwood, Indian almond leaves, or botanicals to your tank. These materials release tannins, which lower the pH and create a tea-colored water that Chili Rasboras love.

Tank Size for Chili Rasboras

Despite their small size, Chili Rasboras are active swimmers and should be kept in groups of at least 6–8 individuals. A 5-gallon tank is the minimum size for a small school, but a 10-gallon tank or larger is recommended for a more natural and spacious setup. The extra space allows for better water quality and more room for plants and decorations.

Tank Setup Tips

• Substrate: Use a dark substrate to enhance their colors.
• Plants: Add live plants like Java moss, Anubias, or floating plants to provide cover and mimic their natural habitat.
• Lighting: Moderate to low lighting is ideal, as bright lights can stress them.
• Filtration: Use a gentle filter, such as a sponge filter, to avoid creating strong currents.

Will Different Chili Rasboras School Together?

Chili Rasboras are highly social fish that thrive in groups. They will school together with their own species, but what about different types of Chili Rasboras? The answer depends on the species. While Chili Rasboras (Boraras brigittae) may occasionally school with closely related species like the Phoenix Rasbora (Boraras merah), they generally prefer the company of their own kind. For the most cohesive and visually appealing school, it’s best to keep a group of the same species.

Chili Rasbora and Phoenix Rasbora: What’s the Difference?

Chili Rasboras and Phoenix Rasboras are often confused due to their similar size and coloration. However, there are subtle differences between the two:

• Chili Rasbora: Bright red body with a prominent black stripe and a slightly smaller size.
• Phoenix Rasbora: More orange or golden in color, with a less defined black stripe.

Both species have similar care requirements and can coexist peacefully in the same tank. However, as mentioned earlier, they may not school together as tightly as a group of the same species.

Chili Rasbora Tank Mates

Choosing the right tank mates for Chili Rasboras is crucial due to their small size and peaceful nature. They do best with other small, non-aggressive fish and invertebrates. Here are some ideal tank mates:

• Other Nano Fish: Ember Tetras, Celestial Pearl Danios, and other Boraras species.
• Shrimp: Cherry Shrimp or Amano Shrimp.
• Snails: Nerite Snails or Malaysian Trumpet Snails.

Avoid keeping Chili Rasboras with larger or aggressive fish, such as Bettas, Cichlids, or Barbs, as they may stress or prey on the Rasboras.

Chili Rasbora Breeding

Breeding Chili Rasboras can be a rewarding experience, but it requires careful planning. These fish are egg scatterers, meaning they lay their eggs among plants or substrate without parental care. Here’s how to encourage breeding:

1. Set Up a Breeding Tank: Use a separate tank with soft, acidic water and plenty of fine-leaved plants like Java moss.
2. Condition the Fish: Feed the adults a high-protein diet of live or frozen foods, such as brine shrimp or daphnia.
3. Spawning: Males will display brighter colors and chase females during courtship. Females will scatter eggs, which the males fertilize.
4. Protect the Eggs: Remove the adults after spawning to prevent them from eating the eggs.
5. Raise the Fry: Once the eggs hatch (in about 24–48 hours), feed the fry infusoria or powdered fry food until they are large enough to eat baby brine shrimp.

Breeding Chili Rasboras can be challenging due to their small size and sensitivity to water conditions, but with patience, it is possible.

Chili Rasbora Temperature and Behavior

Chili Rasboras are tropical fish that prefer water temperatures between 72–82°F (22–28°C). Keeping the temperature stable within this range is essential for their health and activity levels. Sudden temperature fluctuations can stress them and lead to illness.

In terms of behavior, Chili Rasboras are peaceful and shy. They spend most of their time swimming in the middle and upper levels of the tank. When kept in a group, they exhibit schooling behavior, which helps them feel secure. A well-planted tank with plenty of hiding spots will encourage them to display their natural behaviors.

Chili Rasbora at Petco and Other Retailers

Chili Rasboras are widely available at local fish stores and online retailers. Some larger chains, like Petco, may carry them, but availability can vary by location. When purchasing Chili Rasboras, look for healthy fish with vibrant colors and active swimming behavior. Avoid fish that appear lethargic or have faded colors, as these may be signs of stress or illness.

Final Thoughts

Chili Rasboras are a stunning addition to any nano aquarium. Their small size, vibrant colors, and peaceful nature make them a favorite among aquarists. By providing the right tank setup, water conditions, and compatible tank mates, you can enjoy the beauty of these fish for years to come. Whether you’re interested in breeding them or simply watching their schooling behavior, Chili Rasboras are sure to bring life and color to your aquarium.