What size tank does Swordtail need?

Swordtail needs at least 30 gallons before tank mates or bioload are added; larger groups and active fish need more room.

What water parameters does Swordtail need?

Keep Swordtail at 72-82F, pH 7-8.3, GH 10-25 dGH, and KH 4-14 dKH.

Is Swordtail good for beginners?

Swordtail is rated intermediate for beginners. Match its tank size, water parameters, and temperament before choosing tank mates.

What do Swordtail eat?

Swordtail diet is listed as omnivore. Feed a varied aquarium diet suited to that category.

How many Swordtail should be kept together?

Keep at least 3 Swordtail together. Social behavior: group.

Can Swordtail live with shrimp?

Sometimes. Swordtail is marked caution with shrimp, so adults may work with cover but shrimplets can be eaten.

Can Swordtail live with bettas?

Sometimes. Swordtail and Betta need at least 30 gallons, with normal group sizes handled. Swordtail should be kept in a group of at least 3, not as a single add-on.

Swordtail

Xiphophorus hellerii compatibility profile. Find the best tank mates by checking water parameters, aquarium swim zone pressure, social rules, and shrimp-safe verifications.

Core facts & bioload limits

Adult size5"

Minimum tank30 gal

Temperamentpeaceful

Group3+

temperature72-82F
pH7-8.3
water_hardnessGH 10-25 dGH | KH 4-14 dKH
plant_safetysafe
shrimp_safetycaution
algae_eating_rolenone
beginner_suitabilityintermediate

Planning tools

Fish Compatibility CheckerCheck Swordtail against a selected tank mate.Aquarium Stocking CalculatorEstimate Swordtail bioload and group-size pressure.Water Parameter MatcherCompare Swordtail with your temperature, pH, GH, and KH.

Species resources

Swordtail water parameters

Community planning & swim zone pressure

When planning a community around Swordtail, consider the aquarium swim zone pressure. This species primarily occupies the topmiddle zone. Balance the setup by choosing tank mates that occupy the top or bottom zones to reduce crowding and stress.

2026 smart aquarium and aquascape planning for Swordtail

Minimum tank footprint for adult Swordtail

Swordtail needs at least 30 gallons before tank mates, decor displacement, or group-size pressure are added.

Why nano aquarium advice does not fit Swordtail

Aquascape style cannot compensate for a tank that is too small. Match the adult footprint, social group, and filtration first, then choose plants or hardscape.

Does Swordtail need programmable LED sunrise/sunset lighting?

Programmable sunrise and sunset ramps are optional, but gradual lighting can reduce startle behavior in tanks with open swimming lanes or skittish community fish.

Ideal smart heater temperature parameters for Swordtail breeding

Keep the heater inside the listed range of 72-82F; breeding attempts should favor stability over chasing the warmest possible number.

How high water flow from modern powerheads affects Swordtail

Match flow to swim zone and body shape. If Swordtail avoids open water, clamps fins, or hides behind hardscape, reduce direct current and add calmer feeding areas.

Best natural biotope tank mates for Swordtail

Favor tank mates with overlapping temperature, pH, hardness, temperament, and swim-zone use instead of mixing fish only because they share a broad region or store display tank.

Will Swordtail uproot carpet plants in a Dutch style aquascape?

Plant safety is marked as safe. Even plant-safe fish can disturb carpets if they dig, graze aggressively, or crowd the foreground during feeding.

Blackwater botanical setups for Swordtail stress relief

Use botanicals only when the softer, tinted-water style fits the species water range. Keep pH and hardness inside the listed limits instead of dropping them quickly for appearance.

Minimalist Iwagumi aquascape stocking ideas featuring Swordtail

Iwagumi layouts leave fewer visual barriers, so choose peaceful tank mates and avoid territorial species that need caves, dense stems, or broken sightlines.

Care caveats

notesActive mid-sized livebearer; needs real swimming length and careful sex-ratio management.
caveatActive swimmer that needs tank length, not just gallons; nano and short tanks stress adults and shorten lifespan.
caveatMales can spar over territory or harass females — keep more females than males or a male-only group, and provide cover/sight breaks.
caveatBreeds readily in mixed-sex tanks; plan for fry and have a rehoming or separation plan.
caveatDespite common beginner marketing, swordtails are not a true nano fish — plan around adult size and activity, not juvenile appearance.

Conditional tank mates

No green matches are currently published for this species. These yellow matches may work only when the warnings are handled, especially temperature range, group size, flow, and stocking density.

Common pair questions

Can Swordtail live with betta?Pair checker with reason codes