Compatibility Report
GuideMyTank compatibility analysis for Congo Tetra and Freshwater Butterflyfish.
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.
Congo Tetra and Freshwater Butterflyfish receive a conditional verdict from the current structured assessment. Congo Tetra is recorded as peaceful with an aggression level of 1/10; Freshwater Butterflyfish 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.
Congo Tetra has a recorded temperature range of 75–82°F and pH range of 6–7.5. Freshwater Butterflyfish is recorded at 73–86°F and pH 6.5–7.2. Their shared planning window is 75–82°F for temperature and 6.5–7.2 for pH. A shared aquarium must stay inside the overlap rather than merely touching each species’ outer tolerance.
Congo Tetra sets the larger listed base aquarium requirement at 40 gallons; the other listed minimum is 30 gallons. Freshwater Butterflyfish is the larger adult by the recorded maximum, reaching 5 inches, compared with 3.5 inches. These figures are starting constraints, not a stocking-capacity calculation, because the complete group sizes and bioload still matter.
Congo Tetra is a active species associated with the mid zone and moderate flow. Freshwater Butterflyfish is moderate, uses the top zone, and has a low flow preference. Congo Tetra should be planned as a group of at least 6, while freshwater butterflyfish does not have a recorded minimum school larger than one. The aquarium must support both social structures without forcing either species into insufficient space.
Congo Tetra is recorded as a omnivore with intermediate care, while Freshwater Butterflyfish is a carnivore with advanced 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 Congo Tetra and Freshwater Butterflyfish.