TankBud

Slender betta

Betta bellica

Also known as Betta fasciata

FreshwaterFish

Slender betta (Betta bellica)
The Wet Spot Tropical Fish · Used with permission

Care at a glance

Temperature
77–86°F
25–30°C
pH
6.0–7.0
Adult size
3.5 in
9 cm
Minimum tank
20 gal
75 L
Temperament
Mostly peaceful
Social behavior
Solitary
Tankmates
With caution
Swim level
Middle
Difficulty
Medium
Breeding
No record
Rarity
Rare
Family
Osphronemidae
Origin
Sumatra, Malay Peninsula

Overview

The slender betta is a large, streamlined bubble-nesting betta best kept as a single pair or alone rather than in a group. It is an elongate, active fish that patrols the middle water and can be a strong jumper, so a tightly covered tank is essential. It is generally peaceful but will eat small fish and shrimp, so choose calm, similar-sized tankmates or keep it in a species tank. Feed meaty foods such as bloodworm, brine shrimp, small crickets and a good carnivore dry food. Provide a well-planted, shaded tank of at least 75 liters with plenty of surface cover.

In the wild

Betta bellica is found in Sumatra and the Malay Peninsula, in soft, acidic forest streams and peat-influenced waters shaded by overhanging plants. Recreate that with subdued lighting, driftwood, leaf litter, floating plants and a dark substrate. Keep the temperature warm, between 25 and 30 degrees Celsius, and the pH acidic, from 6.0 to 7.0. Soft, tannin-stained water and a calm surface suit it, and dense planting gives this active, jump-prone fish places to feel secure.

Good to know

A member of the gourami family Osphronemidae, the slender betta reaches around 9 centimeters, making it one of the larger and most streamlined bubble-nesting bettas. The species name bellica means warlike, though it is not an especially aggressive fish. The male builds a bubble nest and guards the eggs and fry. Its breeding difficulty is not formally rated, but it needs soft, acidic water and a compatible, well-conditioned pair to succeed.

Did you know

With its long body and pointed fins, the slender betta looks more like a small pike than a typical fighting fish. The name bellica means warlike, a hangover from a time when nearly every wild Betta was assumed to be a fierce fighter.

Common questions

What size tank does a Slender betta need?

A Slender betta needs at least 20 gal (75 L). It spends most of its time in the middle.

What temperature and pH does a Slender betta need?

A Slender betta is comfortable at 77–86°F (25–30°C) with a pH of 6.0–7.0.

How big does a Slender betta get?

An adult Slender betta reaches about 3.5 in (9 cm).

Related species