Rosetail Betta

Betta splendens

Rosetail Betta (Betta splendens) — Intermediate care, Semi-aggressive, under Betta. Minimum tank in the app: 10.6 US gal min; aim for 72–86°F and pH 6–7.5. Details below match the app.

Rosetail Betta (Betta splendens) in a planted freshwater aquarium
Care levelIntermediate
TemperamentSemi-aggressive
Min tank size10.6 US gal min
pH range6–7.5
Temperature72–86°F
Max size2.8 in (7.0 cm)
Captive lifespan3–6 years
SchoolingNo

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.

Rosetail Betta Tank Setup

Plan for at least 10.6 US gal min of water—that is the minimum in our database for a workable setup, not a challenge to crowd fish. Aim to hold 72–86°F and pH 6–7.5 without daily drama. These fish use the Top/Mid zone most, so put wood, plants, or open water there accordingly.

What Do Rosetail Bettas Eat?

We record diet as Carnivore (micro/live foods). Offer a few food types that match—dry, frozen, or gel—and swap now and then. One flake every day for a year is how dull color and gut trouble creep in.

Rosetail Betta Tank Mates

Temperament in the data: Semi-aggressive. Treat small tank mates as potential snacks once the fish grows. Predatory; may eat small fish or inverts. Males must be kept alone; excessive fin branching causes swimming difficulty and fin damage. Plug your full stock list into the stocking calculator—single-species compatibility scores are hints, not a whole-tank verdict.

Are Rosetail 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. If this would be your very first tank, start with something more forgiving and come back to this one.

Building a community? Run the full list through the stocking calculator before you add anything else.

Log tests and reminders in App-aquatic—free, same data you see here.