Compatibility Report
GuideMyTank compatibility analysis for Betta and Clown Killifish.
Planning verdict
cautionOnly plan this pair if every listed condition can be met, and have a separation plan if stress or aggression appears.
No automatic safety blocker was found.
Betta and Clown Killifish receive a conditional verdict from the current structured assessment. Betta is recorded as semi-aggressive with an aggression level of 6/10; Clown Killifish 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.
Betta has a recorded temperature range of 76–82°F and pH range of 6.5–7.5. Clown Killifish is recorded at 68–79°F and pH 5–7. Their shared planning window is 76–79°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.
Betta sets the larger listed base aquarium requirement at 5 gallons; the other listed minimum is 5 gallons. Betta is the larger adult by the recorded maximum, reaching 3 inches, compared with 1.4 inches. These figures are starting constraints, not a stocking-capacity calculation, because the complete group sizes and bioload still matter.
Betta is a calm species associated with the top zone and low flow. Clown Killifish is calm, uses the top zone, and has a moderate flow preference. Betta does not have a recorded minimum school larger than one, while clown killifish should be planned as a group of at least 6. The aquarium must support both social structures without forcing either species into insufficient space.
Betta is recorded as a carnivore with easy care, while Clown Killifish is a carnivore with intermediate care. Their listed preferred tank styles are planted 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.
Only plan this pair if every listed condition can be met, and have a separation plan if stress or aggression appears.
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 Betta and Clown Killifish.