Pygmy Corydoras
The single most reliable betta tank mate in the database.
Care Requirements
Adult Size
2.8" (7cm)
Min Tank
5 gal
Temperature
75-82°F
pH Range
6.5-7.5
Lifespan
3-5 years
Min Group
Can be kept alone
Diet
Carnivore
Swim Level
Top
Bioload
3/10
Hardness
3-12 dGH
About Betta
The Betta fish, scientifically known as Betta splendens, is one of the most popular and recognizable freshwater aquarium fish in the world. Native to Southeast Asia, bettas have captivated fishkeepers for over a century with their stunning colors, elaborate finnage, and surprisingly bold personalities. Often marketed as "easy" fish that can live in tiny containers, the reality is that bettas thrive when given proper care—a heated, filtered tank of at least 5 gallons.
What makes bettas truly unique is their labyrinth organ, a specialized respiratory structure that allows them to breathe atmospheric air directly from the surface. This adaptation evolved in the shallow, oxygen-poor waters of rice paddies and stagnant pools where wild bettas live. While this ability helps them survive in conditions that would kill other fish, it's often misused as justification for inadequate housing.
Bettas were originally domesticated in Thailand (then Siam) for fighting—hence their common name "Siamese Fighting Fish." Over centuries of selective breeding, they've been transformed from relatively drab wild fish into the spectacular varieties we see today. Modern bettas come in virtually every color imaginable and sport fin types ranging from the classic flowing veiltail to the dramatic halfmoon and spiky crowntail. Each betta has a distinct personality; many learn to recognize their owners, follow fingers along the glass, and even perform simple tricks for food.
Natural Habitat & Origin
Conservation status: Vulnerable (VU)
In the wild, bettas inhabit the warm, shallow waters of Southeast Asia's tropical lowlands. They're found in rice paddies, roadside ditches, slow-moving streams, and seasonal floodplains—environments characterized by warm temperatures, dense vegetation, and often stagnant, oxygen-depleted water. These conditions shaped the betta's remarkable labyrinth organ, which allows them to gulp air at the surface when dissolved oxygen is low.
Wild bettas experience significant environmental variation. During monsoon seasons, their habitat expands into flooded areas; during dry seasons, they may be confined to shrinking pools. This adaptability is often misinterpreted as meaning bettas don't need proper care. In reality, while they *can* survive harsh conditions temporarily, they *thrive* in stable, clean, warm water with ample swimming space. Replicating key aspects of their natural habitat—warm temperatures, gentle water flow, plenty of plants and hiding spots—leads to healthier, more vibrant, and longer-lived fish.
Native Region
Southeast Asia (Thailand, Cambodia, Vietnam, Laos, Malaysia)
Habitat Type
Rice paddies, slow-moving streams, shallow ponds, drainage ditches, floodplains
Wild Water Conditions
Warm (75-86°F), soft, acidic (pH 5.0-7.0), heavily vegetated, low dissolved oxygen
Appearance & Varieties
Bettas are small, elongated fish typically reaching 2.5-3 inches (6-7.5 cm) in body length, with males' elaborate fins extending this considerably. The most striking difference between sexes is finnage: males possess long, flowing dorsal, caudal (tail), and anal fins that can span the entire body length, while females have much shorter, more practical fins. Male bettas also display more vibrant colors—from solid reds, blues, and whites to complex multicolored patterns including marbles, koi, and galaxies.
The betta's body is laterally compressed with an upturned mouth adapted for surface feeding. Their ventral (pelvic) fins are long and delicate, often matching tail coloration. When displaying or stressed, males flare their gill covers (opercula) to appear larger, revealing the colorful branchiostegal membrane beneath. Females are generally smaller, less colorful, and display a visible white egg spot (ovipositor) near the ventral fins.
Popular Varieties
| Variety | Appearance | Rarity |
|---|---|---|
| Veiltail | Long, flowing asymmetrical tail that droops downward; most common type sold in pet stores | Very Common |
| Halfmoon | 180-degree tail spread when flared, forming a perfect "D" shape; highly sought after | Common |
| Crowntail | Spiky, separated fin rays extending beyond the webbing, creating a crown-like appearance | Common |
| Plakat | Short-finned variety closer to wild type; more active swimmers, less prone to fin damage | Common |
| Double Tail | Caudal fin split into two distinct lobes; often comes with a larger dorsal fin | Uncommon |
| Dumbo/Elephant Ear | Greatly enlarged pectoral fins resembling elephant ears; comes in various tail types | Uncommon |
| Giant | Selectively bred for larger body size (3-4+ inches); available in various fin types | Rare |
| Rosetail/Feathertail | Extreme ruffling and branching in the tail, beyond halfmoon; can cause swimming difficulties | Uncommon |
Tank Setup & Requirements
Quick Requirements Summary
Min Tank:5gal
Temp:75-82°F
pH:6.5-7.5
Hardness:3-12 dGH
Tank Size
Minimum Tank Size
5 gallons
Recommended Tank Size
10 gallons
Despite the persistent "betta in a bowl" myth, bettas need a minimum of 5 gallons to thrive. Here's why: smaller volumes experience rapid temperature and parameter swings, which stress fish and weaken their immune systems. A 5-gallon tank provides enough space for a heater to maintain stable temperature, a gentle filter for water quality, swimming room for exercise, and territory for the betta to patrol. Many experienced keepers recommend 10 gallons as ideal—more stable, easier to maintain, and allows for tank mates if desired.
Water Parameters
Bettas are tropical fish requiring consistent warm temperatures between 76-82°F (24-28°C). Temperature is perhaps the most critical parameter; cold water suppresses their immune system and slows metabolism, leading to lethargy and disease. Use an adjustable heater with a thermostat—not a preset heater—to maintain stable temperatures. Bettas prefer slightly acidic to neutral water (pH 6.5-7.5) and soft to moderate hardness (3-12 dGH), though they adapt to a range of conditions if changes are gradual.
Substrate
Sand or smooth gravel works well for bettas. Dark-colored substrates help bring out their vibrant colors through a natural response called "background adaptation." Avoid sharp-edged substrates that could tear delicate fins. Bare-bottom tanks are acceptable and easier to clean, though less natural-looking. If keeping live plants, choose a nutrient-rich planted tank substrate.
Plants & Decorations
Bettas love resting near the surface, so broad-leafed plants like Anubias, Java Fern, and Amazon Swords are ideal—or add a "betta hammock" (suction cup leaf). Live plants provide hiding spots, improve water quality, and create a more natural environment. Silk plants are a safe alternative to live plants, but avoid sharp plastic decorations that can tear fins. Include hiding spots like caves, driftwood, or dense plantings—bettas feel more secure with places to retreat.
Filtration & Water Flow
Bettas need filtration for water quality but hate strong currents—their elaborate fins make swimming in flow exhausting. Use a sponge filter (ideal), or baffle a hang-on-back (HOB) filter to reduce output. Pre-filter sponges, spray bars, and flow adjusters help create the gentle circulation bettas prefer. Aim for 2-4x tank volume turnover per hour maximum.
Lighting
Moderate lighting on a consistent schedule (8-10 hours daily) mimics natural day/night cycles bettas need for healthy sleep patterns. Avoid leaving lights on 24/7, which stresses fish. If keeping live plants, match lighting to plant needs. Bettas don't require special lighting but will display colors best under full-spectrum LEDs.
Diet & Feeding Guide
Diet Type
Carnivore
Feeding Frequency
2x daily
Portion Size
2-3 pellets per feeding, or what they consume in 2 minutes
Best Foods for Betta
- High-quality betta pellets — Hikari Betta Bio-Gold, Fluval Bug Bites, Northfin Betta Bits—primary staple
- Frozen bloodworms — Excellent protein treat, feed 1-2x weekly
- Frozen brine shrimp — Good variety, lower protein than bloodworms
- Frozen daphnia — Natural laxative, great for preventing/treating constipation
- Live foods — Daphnia, brine shrimp, mosquito larvae—excellent enrichment and nutrition
- Freeze-dried foods — Bloodworms, brine shrimp—soak before feeding to prevent bloat
Foods to Avoid
- Generic tropical flakes — Low protein content, not formulated for carnivores
- Dry freeze-dried foods (unsoaked) — Expand in stomach causing bloat and constipation
- Overfeeding any food — Most common cause of bloat, swim bladder issues, and early death
- Goldfish food — Wrong nutritional profile, too many carbohydrates
Bettas are carnivores with small stomachs—their eye is roughly the size of their stomach. Feed small amounts twice daily rather than one large feeding. Fast your betta one day per week to aid digestion and prevent constipation, a common issue. Watch for bloated bellies or swimming difficulties, which indicate overfeeding.
Behavior & Temperament
Male bettas are famously territorial and will fight other males to the death—this is hardwired behavior that cannot be trained out. Even seeing their own reflection triggers aggressive "flaring," where they spread their fins and gill covers to appear larger. While occasional flaring (1-2 minutes daily) provides enrichment, constant flaring from seeing reflections or neighboring bettas causes chronic stress.
Despite their aggressive reputation toward their own kind, bettas are remarkably personable with their owners. They quickly learn to recognize who feeds them and will swim to the front of the tank, follow fingers, and beg for food. Many bettas can be trained to swim through hoops, push balls, or jump for food. They're far more interactive and aware than most people expect from a fish.
Active, healthy bettas explore their environment, build bubble nests (males), and display bright colors. Signs of a happy betta include: vibrant coloration, fins fully spread, active swimming and curiosity, good appetite, and regular bubble nest building (males). Signs of stress or illness include: clamped fins held close to the body, faded or dull colors, lethargy and hiding, loss of appetite, glass surfing (repeatedly swimming along the glass), and visible disease symptoms.
Tank Mates: Compatibility Guide
A betta will share a tank, but only with fish that stay out of the top third of it and carry nothing that looks like a rival's fins. Calm, quick, plain-coloured company works; anything slow and trailing, or anything that flares back, does not. The individual fish has the final say, so plan an exit for the tank mates before you buy them.
Best matches
Kuhli Loach
Eel-shaped, nocturnal, and living entirely in the layer of the tank a betta ignores, which makes them close to invisible from a conflict point of view.
Harlequin Rasbora
The best mid-water option when you have the footprint for it.
Also compatible: Otocinclus, Ember Tetra, Panda Corydoras, Chili Rasbora, Celestial Pearl Danio
Avoid
Also avoid: Tiger Barb, Serpae Tetra, Dwarf Gourami, Paradise Fish, Angelfish
Full Betta tank mates guideBreeding Difficulty
Moderate
Breeding Type
Bubble nester
Breeding Setup
Breeding bettas requires a separate 10+ gallon tank with shallow water (5-6 inches deep), no substrate or bare bottom for egg visibility, very gentle or no filtration (eggs and fry are delicate), water temperature at 80-82°F, lots of floating plants (like Indian Almond leaves or Frogbit) for bubble nest anchoring, and a removable divider or separate container for the female.
Breeding Process
Condition both bettas separately for 1-2 weeks with high-protein foods (live or frozen). Introduce the female in a clear container or behind a divider where the male can see but not reach her. A receptive male will build a bubble nest under floating plants. A receptive female will display vertical breeding bars and approach the male with head down. When both are ready, release the female. The male will "embrace" the female, wrapping around her to release eggs which float to the nest. This repeats for several hours. Remove the female immediately after spawning ends—males become aggressive toward spent females. The male tends the eggs and fallen fry for 2-3 days.
Fry Care
Male guards eggs and replaces fallen fry into the nest for 24-48 hours until they become free-swimming. Remove the male once fry are swimming horizontally. Fry are tiny and require infusoria or commercial fry food for the first week, then baby brine shrimp (BBS) once large enough. Maintain warm, stable water and gentle surface agitation for oxygen. By 8-12 weeks, male fry begin showing aggression and must be separated into individual containers to prevent fighting.
Health Issues & Disease Prevention
Bettas are generally hardy when kept properly, but poor water quality, temperature fluctuations, and stress make them susceptible to several common diseases. The key to betta health is prevention: maintain stable warm temperatures, keep water clean with regular changes, avoid overfeeding, and quarantine new additions.
Common Diseases
| Disease | Symptoms | Treatment |
|---|---|---|
| Fin Rot | Ragged, deteriorating fin edges; black, red, or white edges; fins shortening over time | Clean warm water (priority), aquarium salt baths, antibiotics for severe cases (Kanaplex, API Fin & Body Cure) |
| Ich (White Spot) | White salt-like spots on body and fins, flashing/scratching against objects, clamped fins | Raise temperature to 86°F for 10 days, aquarium salt, ich medication (Ich-X) if needed |
| Velvet | Gold or rust-colored dust on body (visible with flashlight), clamped fins, lethargy, loss of appetite | Darkness (velvet is photosynthetic), raise temperature, copper-based medication (Coppersafe) |
| Swim Bladder Disease | Floating sideways, sinking to bottom, difficulty maintaining position, bloated belly | Fast 2-3 days, feed daphnia (natural laxative), Epsom salt bath if constipation-related |
| Dropsy | Pinecone-like raised scales, severely bloated body, lethargy, loss of appetite | Often fatal (indicates organ failure). Epsom salt bath, antibiotics (Kanaplex), improve water quality. Prevention is key. |
| Columnaris | White or gray cottony patches, mouth fungus, saddleback lesions, rapid decline | Lower temperature (slows bacteria), Kanaplex or Furan-2, aquarium salt |
Signs of a Healthy Betta
- Vibrant, bright coloration that pops
- Active swimming and exploration of tank
- Fins fully spread, not clamped against body
- Clear, bright eyes without cloudiness
- Responsive and eager at feeding time
- Regular bubble nest building (males)
- Smooth scales lying flat against body
Prevention Tips
- Maintain stable temperature of 78-80°F with a reliable heater
- Perform 25-50% weekly water changes with dechlorinated water
- Never overfeed—a betta's stomach is the size of their eye
- Quarantine new tank mates for 2-4 weeks before adding
- Keep the tank cycled with an established nitrogen cycle
- Avoid sudden parameter changes—acclimate slowly
- Provide hiding spots to reduce stress
Frequently Asked Questions
With proper care, bettas live 3-5 years on average, with some reaching 7+ years. Most pet store bettas are already 6-12 months old when purchased. Lifespan depends heavily on genetics, water quality, diet, and avoiding the stress of inadequate housing. Bettas from specialty breeders often live longer due to better genetics.
Minimum 5 gallons, though 10+ gallons is ideal. Despite the pervasive myth, bettas cannot thrive in bowls, vases, or tiny "betta cubes." They need space to swim, stable water parameters (impossible in small volumes), and room for a heater and filter. Larger tanks are actually easier to maintain and provide a healthier environment.
Yes—in fact, male bettas generally prefer living alone. They're not social fish that get "lonely." A single betta in a well-decorated tank with plenty of enrichment (plants, hiding spots, varied feeding) is a happy betta. Adding tank mates is optional and comes with risks that must be carefully managed.
Yes, with careful selection and in a large enough tank (10+ gallons). Avoid colorful, long-finned fish (which trigger territorial aggression) and fin nippers. Best tank mates are peaceful bottom dwellers (Corydoras, Kuhli Loaches), small fast schoolers (Neon Tetras, Harlequin Rasboras), and snails. Individual betta temperament varies wildly—always have a backup plan.
Bettas are carnivores requiring high-protein foods. Feed high-quality betta pellets (Hikari, Fluval Bug Bites, Northfin) as a staple, supplemented with frozen bloodworms, brine shrimp, and daphnia 1-2x weekly. Feed 2-3 small pellets twice daily. Avoid generic tropical flakes and overfeeding—the most common cause of health problems.
Twice daily, with small portions they can finish in 2 minutes (typically 2-4 pellets per feeding). Fast one day per week to prevent bloating and aid digestion. Bettas are prone to constipation and overeating. Their stomach is approximately the size of their eye—a useful mental image for portion control.
Yes, bettas are excellent beginner fish when properly housed. They're hardy, don't require a massive tank, tolerate some mistakes, and have engaging personalities that make fishkeeping rewarding. However, they still need a heated (78-80°F), filtered tank of at least 5 gallons—not a bowl. Set up the tank properly, and a betta is a fantastic first fish.
Males have longer, more elaborate fins and brighter, bolder colors. Females have shorter fins, less intense coloration, and a visible white "egg spot" (ovipositor) near the ventral fins. Males build bubble nests; females do not. Young or stressed bettas can be harder to sex. In pet stores, males are usually kept individually while females may be housed together.
New bettas often hide while adjusting to their environment (1-2 weeks is normal). Other causes include: stress from poor water quality, illness, too much light or activity outside the tank, aggressive tank mates, or insufficient hiding spots (paradoxically, more hides = more confidence). Some hiding is normal; constant hiding combined with other symptoms (color loss, appetite loss) indicates a problem.
In a filtered, cycled tank: 25-30% weekly is standard. In unfiltered tanks (not recommended): 50% every 2-3 days. Never change 100% at once—this shocks the fish and destroys beneficial bacteria. Always match temperature and use dechlorinator. More frequent small changes are better than infrequent large ones.
Tips for Keeping Betta
Pro Tips
- ✓Add Indian Almond leaves or Alder cones to your tank—they release tannins that mimic natural habitat, have mild antibacterial properties, and encourage bubble nest building
- ✓Use an adjustable heater with thermostat, not preset heaters—you need precise control to maintain stable 78-80°F
- ✓Add a betta hammock or position broad-leafed plants (Anubias, Java Fern) near the surface—bettas love resting spots near their air source
- ✓When adding tank mates, introduce them before the betta—this reduces territorial aggression since the betta won't view the tank as "his" yet
- ✓A mirror shown for 1-2 minutes daily provides enrichment through flaring exercise—but don't overdo it or leave it permanently, which causes chronic stress
Common Mistakes to Avoid
- ✗Keeping in unheated bowls or tanks under 5 gallons—leads to temperature stress, disease, and shortened lifespan
- ✗Overfeeding—the single biggest killer of bettas; their stomach is the size of their eye
- ✗Strong filter current—exhausts bettas with long fins; use sponge filters or baffle HOB output
- ✗Sharp plastic decorations—shred delicate fins; use silk plants or live plants instead
- ✗Adding to uncycled tanks—ammonia and nitrite poisoning kills quickly; fishless cycle first
- ✗Housing males together—they WILL fight, often to the death; no exceptions
- ✗Assuming lethargy is normal—healthy bettas are active and curious; lethargy indicates cold water, illness, or stress
Sources
- FishBase — Accepted scientific name, maximum size and native range for Betta.
- IUCN Red List — Vulnerable conservation assessment for Betta splendens.
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