Raja Betta
Betta sp.
Raja Betta (Betta sp.) — Intermediate care, Semi-aggressive, under Betta. Minimum tank in the app: 26 US gal min; aim for 72–81°F and pH 6–7.5. The Raja Betta is ideal for the aquarist seeking a unique, semi-aggressive species that showcases striking coloration and personality.

Captive lifespan reflects typical experience in a home aquarium, not maximum recorded age; genetics, sourcing, and care vary.
Natural distribution
Southeast Asia
- East & Southeast Asia
Regional colours match the stocking calculator’s origin map.
Raja Betta Tank Setup
Create a habitat that balances open swimming space with plenty of hiding spots using plants and decorations to diffuse aggression. Utilize soft substrate to prevent injury to their delicate fins and ensure moderate water flow to mimic their natural habitat. Dim lighting promotes comfort and encourages natural behaviors, while strategic layout can minimize direct lines of sight between potential rivals.
What Do Raja Bettas Eat?
Raja Bettas exhibit a competitive feeding style, favoring live or frozen foods which can lead to rapid consumption. Providing a varied diet is crucial for health and vibrancy, but be mindful of feeding times to avoid over-excitement and aggression.
Raja Betta Tank Mates
Ideal tank mates include robust species that occupy different swim zones, such as larger rasboras or peaceful catfish, minimizing competition at the surface and mid-levels. Avoid small, slow-moving fish or invertebrates, as they are at risk of predation. Intraspecies interactions can escalate quickly, so keep only one Raja Betta per tank unless adequately separated by dividers.
Are Raja Bettas Good for Beginners?
We rate this as intermediate. Budget time for testing, maintenance, and watching behaviour if the water looks fine but the fish do not. Aquarists often underestimate the Raja Betta's aggression and territorial needs, leading to mismatched tank mates or overcrowding. Inadequate hiding spots can result in stress and injury, while ignoring water quality and temperature parameters can compromise their health and color vibrancy.
Building a community? Run the full list through the stocking calculator before you add anything else.
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