Compatibility Report
GuideMyTank compatibility analysis for Cardinal Tetra and Golden Wonder Killifish.
Planning verdict
incompatibleDo not plan a shared aquarium for this pair. Choose a different tank mate or maintain separate aquariums.
Cardinal Tetra and Golden Wonder Killifish receive a not recommended verdict from the current structured assessment. Cardinal Tetra is recorded as peaceful with an aggression level of 1/10; Golden Wonder Killifish is recorded as semi-aggressive with an aggression level of 4/10. The recommendation is based on the combined water, space, behavior, grouping, and predation checks below rather than on species names alone.
Cardinal Tetra has a recorded temperature range of 73–84°F and pH range of 5–7. Golden Wonder Killifish is recorded at 72–82°F and pH 6.5–7.5. Their shared planning window is 73–82°F for temperature and 6.5–7 for pH. A shared aquarium must stay inside the overlap rather than merely touching each species’ outer tolerance.
Cardinal Tetra sets the larger listed base aquarium requirement at 20 gallons; the other listed minimum is 20 gallons. Golden Wonder Killifish is the larger adult by the recorded maximum, reaching 4 inches, compared with 2 inches. These figures are starting constraints, not a stocking-capacity calculation, because the complete group sizes and bioload still matter.
Cardinal Tetra is a calm species associated with the mid zone and moderate flow. Golden Wonder Killifish is moderate, uses the top zone, and has a moderate flow preference. Cardinal Tetra should be planned as a group of at least 8, while golden wonder killifish does not have a recorded minimum school larger than one. The aquarium must support both social structures without forcing either species into insufficient space.
Cardinal Tetra is recorded as a omnivore with intermediate care, while Golden Wonder Killifish is a carnivore with intermediate care. Their listed preferred tank styles are blackwater and predator. Feeding access, cover, open swimming room, filtration, and observation should be planned around the more demanding requirement rather than averaged between the two species.
Use these pair-specific boundaries before treating the verdict as an acceptable stocking plan.
Do not plan a shared aquarium for this pair. Choose a different tank mate or maintain separate aquariums.
These references support the underlying species records used by this assessment. They do not necessarily evaluate this exact pair together.
Continue with the most relevant care and compatibility resources for Cardinal Tetra and Golden Wonder Killifish.