Betta Fish Care Guide: The Ultimate Freshwater Guide (Betta splendens)
Quick Answer
Betta fish (Betta splendens), also known as Siamese fighting fish, are highly popular freshwater aquarium fish famed for their magnificent colors and elaborate finnage. They require a minimum 5-gallon aquarium with a pH of 6.5 - 7.5 and a temperature range of 24-28°C. As territorial carnivores, especially aggressive between males, careful tank mate selection (or solo housing) is essential.
Quick Facts
| Scientific Name | Betta splendens |
|---|---|
| Common Names | Betta Fish |
| Family | Osphronemidae |
| Type | Freshwater Fish |
| Temperament | aggressive |
| Care Difficulty | beginner |
| Lifespan | 2-5 years |
| Maximum Size | Up to 3 in (8 cm) |
| Diet | Carnivore |
| Temperature | 75–82°F (24–28°C) |
| pH | 6.5–7.5 |
| Minimum Size | 5 gallons |
Key Takeaways
- Known for its territorial, aggressive temperament, especially between males.
- Requires at least a 5-gallon heated, filtered aquarium.
Health
Fin and Tail Rot
A common bacterial (sometimes secondary fungal) infection affecting the fins, especially relevant to bettas given their exaggerated finnage.
- Fraying, discoloration, or receding fin edges; fins may appear ragged or shortened over time.
Typically triggered by poor water quality, physical fin damage (from decor or fin-nipping tank mates), or stress-related immune suppression.
Regular water changes, appropriately cycled and filtered tank, smooth decor, and avoiding known fin-nipping tank mates.
Swim Bladder Disorder
A common issue in bettas causing abnormal buoyancy, frequently linked to their body shape and feeding habits.
- Difficulty maintaining normal swimming position; floating sideways, sinking, or struggling to swim upright.
Most often associated with overfeeding, constipation, or gulping air while eating; can occasionally reflect an underlying organ issue.
Feed appropriately sized portions, avoid overfeeding, and soak pellets briefly before feeding to reduce air-gulping and swelling.
Velvet Disease (Piscinoodinium/Oodinium)
A parasitic infection that can affect bettas as it does many freshwater fish, not unique to the species.
- Fine gold or rust-colored dusting on the skin, clamped fins, lethargy, and labored breathing.
Introduced via unquarantined fish, plants, or equipment; more likely to take hold when a fish is stressed or immunocompromised.
Quarantine new fish and live plants before adding them to an established tank; maintain stable water quality.
Breeding
Bettas are bubble-nest builders: the male constructs a nest of mucus-coated bubbles at the water’s surface, and after a spawning embrace the male collects the eggs and tends the nest, generally driving the female away afterward. Successful home breeding requires a dedicated, heavily covered breeding tank, careful conditioning of both fish, and removal of the female (and eventually the male) to prevent egg or fry predation.
Compatible Tank Mates
Popular Betta Tail Types
Popular Betta Tail Types
| Type | Key Feature | Care Level |
|---|---|---|
| Halfmoon | 180-degree tail spread | Moderate |
| Plakat | Short fins, closer to wild type | Easy |
| Crowntail | Webbing reduced between rays | Moderate |