Should I buy it?
Betta
Betta splendens
Also known as: siamese fighting fish, betta splendens (trade name), Siamese fighting fish, Betta splendens (trade name)
For a single-species setup, this fish is often a good choice. In community tanks, compatibility depends heavily on tank mates.
Fishori provides conservative planning guidance, not guarantees.
Based on multiple reputable aquarium care sources with strong agreement. Use the numbers here as planning defaults — your room, water, and routine still shape real-world outcomes.
Best kept solo. A community betta tank is a coin-flip even with the right tank mates. A 75L+ planted sorority setup is barely better odds.
Best for
Single-fish 25L+ planted tanks, or experienced keepers building a betta-led setup with corydoras and snails.
Avoid if
You wanted a community fish; you keep guppies (males look like rivals); or you can only commit to a 5L bowl.
Top things that go wrong
- Shrimp & snails. Shrimp: depends on the individual fish. Some leave them alone, others hunt cherry shrimp down within a week of meeting them.
Common mistakeColourful guppies in a small tank with a male betta. The betta reads every bright flash as a rival to drive off.
What most shops don't tell you
- 1.Spawning, breeding, or rearranging territory can make normally calm fish surprisingly aggressive in short tanks or with rival shapes.
- 2.Long-finned males in strong filter flow with no rest spots. They tire on the current and shred fins on equipment. Damage gets blamed on tank mates before flow gets cut.
- 3.Feeding only dry pellets. Bettas go on hunger strikes when bored of one food, and pellets swell in the stomach when eaten too fast.
- 4.Two males in one tank end in a dead fish, sometimes the same day. Pick tank mates that are fast, calm, and dull-coloured so they do not provoke a fight. Buy a lid before the fish. They jump.
- 5.Male bettas are territorial; tank mate choice is individual-dependent.
About this species
Bettas are labyrinth fish that gulp air at the surface as well as breathe through gills. A male will fight any other male on sight, and reads most long-finned or bright fish as another male.
- Honey Gourami40L min · same group, similar adult size
- Sparkling Gourami40L min · same group, similar adult size
- Dwarf Gourami60L min · same group, similar adult size
- Chocolate gourami80L min · same group, similar adult size
- Croaking gourami80L min · same group, similar adult size
- Pearl Gourami100L min · same fish family
- Paradise fish120L min · same group, similar adult size
- Opaline gourami150L min · same fish family
- Ghost Shrimpalso beginner semi-aggressive, similar tank size
- Corydoras Catfish tank mateslists this fish as a safe and recommended mate
- Kuhli Loach tank mateslists this fish as a safe and recommended mate
- Otocinclus tank mateslists this fish as a safe and recommended mate
- Pygmy Corydoras tank mateslists this fish as a safe and recommended mate
Plan grid
Key limits are shown above; this section adds planning detail: pH band, swim level, bioload and activity, and the radar.
Swim zones
Planning trait chart
Six indices for comparing species on paper before you spend.
- Beginner ease63
- Peacefulness44
- Community fit39
- Small-tank fit100
- Hardiness79
- Energy54
Numbers are deterministic planning indices from Fishori fields — not a scientific score of your individual fish.
Common setup sketches
Conservative patterns from Fishori fields — still run the pair checker for every species you add; sketches are not a stocking guarantee.
Avoid “one of everything” baskets — Betta belongs in a plan built around territory, line-of-sight breaks, and matched water chemistry.
Tank mate intelligence
Safest tank mates stay out of the betta's water column: corydoras and kuhli loaches on the bottom, nerite snails and amano shrimp on cleanup. Skip mid-water shoals and any long-finned fish.
Pair-level compatibility with this fish as anchor.
Read the blocking rule on each pair page before experimenting.
Do-not-stock combinations on conservative hobby rules.
Compare with
Run a real pair check: Betta + Corydoras Catfish
Behaviour, temperament, and what to watch
Prose and lists come from the same record: read temperament first, then glass-level signals so you are not surprised after day three.
Solitary and territorial. Two males in one tank end with one dead male, usually the same day. Sororities work in a 75L+ planted tank, but most still fail.
Stress / aggression triggers on file
- Another male betta, or anything mirror-shiny
- Colourful or long-finned tank mates that read as rival males
- Cramped tanks with nowhere to break line of sight
Fin nipping: Not a habitual fin-nipper, but individuals can still test fins under stress or in a crowded tank.
Predation: Not a predator toward similarly-sized community fish. The usual community caveats about mouth size still apply for very small fry or shrimp.
Territory: Holds territory on substrate, in caves, or at the surface film. Break the line of sight with hardscape, and avoid placing the tank where the fish can see its own reflection.
Planted tanks: good — easy plant ideas
In the glass: typical and warning signs
- Moderate pacing — not hyperactive, not motionless.
- Clamped fins, gasping at the surface, hiding non-stop, or refusing food after the first week.
- Rapid breathing when parameters swing — fix ammonia/nitrite first, then reassess mates.
- Chasing one individual repeatedly, torn fins on tank mates, or food theft every feed.
- Corner guarding, flaring, or body-blocking — territory is normal until it becomes relentless.
- Separate or rehome if injuries appear, one fish is pinned, or feeding becomes a daily chase.
- If water is stable but behaviour worsens, reduce stocking or remove the highest-impact species first.
Fish behaviour can vary between individuals and tank setups. Always observe new fish closely after introduction.
Care parameters: water, food, inverts, grouping
Chemistry and group rules sit here so you are not re-reading the same line from tank mate or temperament blocks. Swim level is in the plan grid above.
Hardness
soft
Diet
carnivore
Small invertebrates, frozen bloodworm or daphnia, and protein-rich prepared foods. Rotate the menu and feed by appetite rather than by clock.
Shrimp & snails
Shrimp: depends on the individual fish. Some leave them alone, others hunt cherry shrimp down within a week of meeting them.
Kept singly or as a paired setup. Check the species profile before doubling up in one tank.
Breeding behaviour depends on the species. Research before you buy a mixed-sex group of this fish.
- Hold 24 to 30 °C steadily on a real thermometer, not the dial on the heater.
- Aim for pH 6.5 to 7.5 and a hardness you can re-test in two weeks. A one-time strip in the shop car park is not a water test.
- Footprint: short wide tanks and tall narrow tanks fish differently for the same volume. Match the tank shape to the swim pattern, not just the litre count.
- Tank volume meets or exceeds 20L published minimum for adults.
- Heater can hold 24–30°C without cooking cooler-water tank mates.
- No known fin-nippers paired with long-finned fish unless you accept documented risk.
Explore and stocking hubs
Same library as the rest of Fishori: tank-mate index for this species, category peers, guides, and litre-based stocking lists where min tank on file is within the hub volume.
Plan with tools
Pair-level rules and multi-fish stocking use the same conservative engine — add this fish in the tank builder only after mates pass pair checks.
Filtration & heating
A 20L minimum tank needs a filter rated for at least 80L/hr turnover and a heater to hold 24–30°C reliably.
Plant suggestions
Betta does well in planted tanks. Plants compatible with 24–30°C and pH 6.5–7.5:
Profile status: verified · Evidence tier: high · 4 linked source(s). Fishori does not fabricate citations.
Fishori uses conservative planning rules based on these sources.
Confidence is explained in the summary at the top of this page (same tier as here), not repeated below.
How Fishori evaluates compatibility (same logic as pair and tank tools).
- Seriously Fish. Betta splendens
Primary: aquarium size, water chemistry, behaviour, and compatibility (URL verified in upgrade script; recheck if site content changes).
- FishBase. Betta splendens
Secondary: taxonomy, distribution, and maximum length in nature; cross-check with aquarium import lines and measured tank parameters.
- Wikipedia. Betta splendens
Secondary: general species context; verify all husbandry numbers against a dedicated aquarium care sheet and your test kit, not a single table row.
- Wikipedia. Betta splendens
Encyclopaedia overview; use specialist aquarium sources for your stock's real temperature/pH/footprint needs.
Evidence notes
- The Seriously Fish profile for the binomial in this record was successfully reached as the primary aquarium reference.
- FishBase contributes natural-range size and habitat context. Translate those numbers through your heater, your water report, and your tank footprint before stocking.
- Wikipedia is only cited if the article URL returned OK. Use it for orientation, not as the only care sheet for an import.
- All compatibility text reflects typical hobby experience and the Fishori model. Individual fish, shop stress, and the order tank mates are added in can still defy a single-paragraph label.
- Fishori profiles work from typical aquarium trade sizes and hobby care norms. Specialist site checks and literature review for this species are not yet recorded here, so the ranges on this page are planning numbers rather than guarantees.