Other Names: Japanese fighting fish, Siamese fighting fish, and Labyrinth Fish

Appearance and Coloration:
Bettas are best known for their striking appearance, with long, flowing fins in males and shorter, more compact fins in females. Through selective breeding, Bettas now come in nearly every color imaginable—red, blue, turquoise, black, white, metallic, and even multi-color patterns like marble, koi, and dragon scale. They can have tail types including veil tail, crown tail, halfmoon, delta, and plakat (short-finned variety).

Behavior and Temperament:
Bettas are solitary and often aggressive, especially the males, who will fight other males and sometimes even females if not introduced carefully. In nature, these fish display aggression to protect their territory. This has led to their use in historical betta fighting matches in Thailand. Today, responsible aquarium keepers avoid keeping multiple males together and often provide separate tanks or dividers.

Habitat Requirements:
Bettas are tropical fish and require warm water, ideally between 76°F and 82°F (24°C to 28°C). They prefer slightly acidic to neutral pH (6.5–7.5) and soft to moderately hard water. Bettas are labyrinth fish, meaning they have a special organ that allows them to breathe atmospheric oxygen. This adaptation allows them to survive in oxygen-poor environments, but they still need clean water and proper filtration to stay healthy in captivity.

Tank Setup:
Contrary to the myth that Bettas can live in tiny bowls, they thrive in tanks of 5 gallons (19 liters) or more, with heaters, filters, and plants or decorations that allow hiding and resting. Sharp decorations should be avoided to prevent fin damage. Floating plants or leaf hammocks near the surface are appreciated, as Bettas like to rest close to the top.

Feeding:
Bettas are carnivorous, and in the wild, they feed on small insects, larvae, and zooplankton. In captivity, they should be fed a high-protein diet including specially formulated Betta pellets, frozen or live foods such as bloodworms, brine shrimp, and daphnia. Overfeeding should be avoided, and they can safely fast for a day or two each week to prevent bloating or constipation.

Breeding:
Male Bettas build bubble nests at the water’s surface using air and saliva. During breeding, the male wraps around the female and fertilizes the eggs as she releases them. He then collects the eggs and places them in the bubble nest, guarding them until they hatch. After spawning, the female should be removed to avoid aggression from the male.

Lifespan:
With proper care, Bettas can live 3 to 5 years, though some may live longer under ideal conditions.

Female Bettas, in contrast, can sometimes live together in groups (a “sorority”), but only in well-planted tanks of at least 20 gallons with plenty of hiding spots to minimize territorial conflict.

Compatible Tank Mates

When selecting tank mates for a Betta, look for peaceful, non-fin-nipping species that inhabit different regions of the tank and don’t resemble Bettas (to avoid provoking aggression). Here are some widely recommended companions: Corydoras Catfish, Neon or Embers Tetras, or Cardinal Tetras.

Key Facts About Their Natural Habitat:

• Low Oxygen: Bettas have a labyrinth organ that lets them breathe air, helping them survive in oxygen-poor waters.

• Warm Temperature: They thrive in warm water between 75°F and 86°F (24°C–30°C).

• Soft, Slightly Acidic Water: Their environment has soft water with a pH around 6.0 to 7.0, often tinted by decaying plant matter.

Natural Space:
In the wild, Bettas occupy small, shallow, plant-filled waters just a few square feet in size. Males fiercely defend these small territories. Their natural habitat has plenty of plants and hiding spots that reduce stress and aggression.

• Safe for Betta fins (avoid sharp plastic plants).

• Add color and shelter without the maintenance of live plants.

• Caves and Hiding Spots ($5-$20)

  • Examples: Coconut shells, ceramic caves, resin ornaments with smooth edges.

  • Give Bettas places to rest and feel secure.

  • Floating Decorations or Leaf Hammocks ($7-$15)

  • Bettas like resting near the water surface.

    • Leaf hammocks provide a gentle place to rest without damaging fins.

• Provides a natural day/night cycle to help regulate your Betta’s behavior and health.

• Supports the growth of live plants if you have them in your tank.

• Enhances the colors of your Betta and makes your aquarium visually appealing.

Do You Need Tank Lighting?

• While Bettas don’t require special lighting, a consistent light source benefits their well-being and is essential if you keep live plants.

• If your tank is in a well-lit room with natural light, additional lighting may not be necessary, but controlled lighting helps prevent algae growth and keeps a stable environment.

How Long Should the Light Be On?

• Aim for 8 to 12 hours of light per day, mimicking a natural day cycle.

• Too much light can promote algae growth; too little can affect plant health and fish behavior.

• Prevents bettas from jumping out

• Reduces water evaporation

• Keeps dust and debris out

• Holds lighting for better viewing and plant growth

• Helps maintain stable temperature

Do you need one?
Not essential but highly recommended. If your betta jumps or water evaporates fast, a hood is helpful. Without issues, you might skip it but be cautious.

Bottom line: A hood cover protects your betta and keeps the tank healthier.

Do you need a water heater?
Most likely, yes.
Room temperature is often too cool for bettas, so a heater helps keep the water within their comfortable range and supports their health.

Good filter options:

• Sponge filter (gentle and safe)

• Hang-on-back (HOB) filter with adjustable flow

• Internal filter with a low flow setting

Avoid strong filters like powerful canisters unless you can control the flow.

Here’s why:

• Space: Bettas need enough room to swim freely. Smaller bowls or tanks under 2.5 gallons can cause stress and health problems.

• Water quality: Larger tanks are easier to maintain stable water conditions, which is essential for bettas.

• Enrichment: A 5-gallon tank allows room for plants, hiding spots, and gentle filtration, creating a more natural and comfortable environment.

Do you need to add anything specific to the tank for them to get air?
Not really! But there are a few important points to keep in mind:

• Provide access to the water surface: Make sure the tank has an open area at the top so your betta can easily reach the surface to breathe.

• Avoid tight lids or covers that block access: Bettas need to breathe air, so don’t seal the tank completely.

• Gentle water flow: Bettas prefer calm water. Strong filters or bubblers can stress them, but gentle filtration is good to keep the water clean.

So, your betta gets air by surfacing naturally, and as long as the tank setup allows easy access to the water surface, they’ll be just fine.

National Geographic. (n.d.). Betta fish. Retrieved August 20, 2025, from https://www.nationalgeographic.com/animals/fish/facts/betta-fish

The Spruce Pets. (2023). Betta fish care: How to keep your betta happy and healthy. Retrieved August 20, 2025, from https://www.thesprucepets.com/betta-fish-care-1381000

FishLab. (2021). Best tank size for betta fish. Retrieved August 20, 2025, from https://fishlab.com/best-tank-size-for-betta-fish/