Betta
Betta splendens
The iconic Siamese fighting fish with flowing fins and bold personality.
| Difficulty | Beginner |
| Min. Tank Size | 19 L |
| Temperature | 24.0–28.0 °C |
| pH Range | 6.0–7.5 |
| Max Size | 7.0 cm |
| Lifespan | 3-5 years |
| Diet | Carnivore |
| Temperament | Aggressive (males) |
Overview
The Betta (Betta splendens) is the iconic Siamese fighting fish with flowing fins and bold personality. It is one of the most recognisable members of the bettas group kept by Australian aquarists, valued for its appearance, manageable adult size of around 7.0 cm and its aggressive (males) nature.
This guide covers everything you need to keep the Betta successfully - ideal tank size and setup, water parameters, diet, suitable tank mates, breeding, how to tell males from females, and the health problems to watch for. Rated Beginner to care for, it can live for roughly 3-5 years when its needs are met.
Natural Habitat & Origin
The betta is a labyrinth fish native to the warm, still, shallow waters of Thailand (Siam) - rice paddies, marshes and slow canals. These oxygen-poor waters explain its surface-breathing labyrinth organ and its dislike of strong current. A warm, gently filtered, well-planted tank mirrors its home.
Understanding where a fish comes from is the shortcut to keeping it well: matching the temperature, water chemistry and amount of cover it evolved with is far more effective than fighting against its nature.
Tank Size & Aquarium Setup
Provide a minimum of 19 litres for the Betta. A larger footprint gives it room to establish territory and reduces stress.
Use a secure, well-fitting lid (this species can jump, and labyrinth fish also need a warm layer of air above the water).
Live plants, driftwood and some shaded retreats give the fish security and show off its colours against a natural backdrop.
Mature, well-cycled biological filtration is essential before adding any fish. Keep the flow gentle, as this species dislikes strong current.
Water Parameters
Keep the Betta in stable water at 24-28 °C with a pH of 6.0-7.5. It is adaptable across a moderate range, so stability matters more than hitting an exact number.
Test your water regularly: ammonia and nitrite must always read zero, and nitrate should be kept low (ideally under 20-40 ppm) with routine partial water changes. Sudden swings in temperature or chemistry cause far more illness than water that is slightly 'wrong' but stable, so always dechlorinate and temperature-match new water.
Diet & Feeding
The Betta is a carnivore. Base its diet on meaty foods - frozen or live bloodworm, daphnia, brine shrimp and a good carnivore pellet - rather than plant-based flakes it cannot fully digest.
Feed small amounts once or twice a day - only as much as the fish clears in a minute or two - and consider one fasting day a week. Overfeeding is the single most common cause of pollution and disease in home aquariums.
Temperament & Tank Mates
The Betta is best kept alone or with very carefully chosen, robust tank mates. Avoid keeping it with its own kind unless you have the space and experience, and steer clear of long-finned, slow or timid species it may harass.
Breeding
The Betta is a bubble-nest builder. The male constructs a raft of bubbles at the surface, entices the female beneath it, then tends the eggs and fry himself - remove the female after spawning.
Even if you do not plan to breed it, understanding this behaviour helps you recognise it in the tank and respond appropriately - for example by adding cover for fry or by giving a guarding pair some space.
How to Tell Males from Females
Male bettas have long, flowing fins and intense colour, while females are shorter-finned, generally less vivid, and show a small white 'egg spot' when mature.
Common Health Problems
Like most aquarium fish it is susceptible to white spot (ich), fin rot and fungal infections, almost always triggered by stress or poor water quality. Quarantine new arrivals for 2-4 weeks to keep your main tank disease-free.
Prevention is far easier than cure: keep water pristine, avoid overstocking and overfeeding, quarantine new arrivals for two to four weeks, and watch daily for early warning signs such as clamped fins, loss of appetite, flashing (rubbing on objects) or laboured breathing. Caught early, most problems are very treatable.
Is the Betta Right for You?
The Betta is a rewarding choice for beginners and experienced keepers alike, as long as you can provide at least 19 litres, water at 24-28 °C and pH 6.0-7.5, the right diet and suitable tank mates.
Get those basics right and you will enjoy a healthy, colourful Betta for around 3-5 years. For tank planning, try our free aquarium tools, and browse our fish, plant and disease guides to build the perfect community.