Compatibility Report
GuideMyTank compatibility analysis for Golden Wonder Killifish and Harlequin Rasbora.
Planning verdict
incompatibleDo not plan a shared aquarium for this pair. Choose a different tank mate or maintain separate aquariums.
Golden Wonder Killifish and Harlequin Rasbora receive a not recommended verdict from the current structured assessment. Golden Wonder Killifish is recorded as semi-aggressive with an aggression level of 4/10; Harlequin Rasbora is recorded as peaceful with an aggression level of 1/10. The recommendation is based on the combined water, space, behavior, grouping, and predation checks below rather than on species names alone.
Golden Wonder Killifish has a recorded temperature range of 72–82°F and pH range of 6.5–7.5. Harlequin Rasbora is recorded at 73–82°F and pH 6–7.5. Their shared planning window is 73–82°F for temperature and 6.5–7.5 for pH. A shared aquarium must stay inside the overlap rather than merely touching each species’ outer tolerance.
Golden Wonder Killifish 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.
Golden Wonder Killifish is a moderate species associated with the top zone and moderate flow. Harlequin Rasbora is active, uses the mid zone, and has a moderate flow preference. Golden Wonder Killifish does not have a recorded minimum school larger than one, while harlequin rasbora should be planned as a group of at least 8. The aquarium must support both social structures without forcing either species into insufficient space.
Golden Wonder Killifish is recorded as a carnivore with intermediate care, while Harlequin Rasbora is a omnivore with easy care. Their listed preferred tank styles are predator and blackwater. 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 Golden Wonder Killifish and Harlequin Rasbora.