Why do bettas attack other labyrinth fish?

Bettas evolved as territorial anabantoids and their aggression is specifically tuned toward anything that shares their niche. A sparkling gourami reads as a direct competitor for surface territory and food.

What is the minimum tank size for sparkling gouramis?

Sparkling gouramis need a minimum of 10 gallons for a pair, with 15 gallons being better if you want a small group or tankmates. Dense planting is essential to break sight lines and provide cover.

Do sparkling gouramis make noise?

Yes. They produce an audible croaking or growling sound using a specialized pectoral fin mechanism. It happens most often during territorial disputes between males and during breeding displays.

Can Betta Fish Live With Sparkling Gourami?

By Alex WalshLast reviewed Apr 18, 2026

No, both bettas and sparkling gouramis are labyrinth fish that occupy the surface, and bettas will attack anything that resembles another anabantoid.

Why

Bettas and sparkling gouramis are both labyrinth fish that breathe air at the water surface and prefer the top of the tank, creating direct territorial overlap.
Bettas are territorial by nature and treat other labyrinth breathers as competitors, attacking them more readily than they would a non-anabantoid fish.
Sparkling gouramis reach only 1.5 inches, so even a moderate charge from a betta can cause injury or death.
Sparkling gouramis are also carnivores with similar feeding niches, so food competition adds another layer of stress.

Minimum shared tank

10 gallons

Shared temperature range

74-82°F

What could go wrong

A betta will chase and attack a sparkling gourami at the surface, and the gourami has nowhere to escape in a small nano tank. The stress alone shortens the gourami's lifespan.

If you keep them in separate tanks

Sized for the 10 gallon minimum this pairing needs. Affiliate links — we earn a small commission if you buy through them.

AquaClear 20 Power Filter

Rated for up to 10 gallons with enough biological media to handle the waste from both species.

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Eheim Jager 100W Thermostat Heater

Holds a steady temperature inside the 74-82°F window both species need.

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API Freshwater Master Test Kit

Keep ammonia, nitrite, and nitrate in check. Two-species tanks have more bioload and less margin for error than single-species setups.

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Better pairings to consider

Bettas do well with nerite snails and mystery snails in nano tanks. Sparkling gouramis do well with ember tetras, celestial pearl danios, and pygmy corydoras in a 10-15 gallon planted tank.