Compatibility Report
GuideMyTank compatibility analysis for Angelfish and Cardinal Tetra.
Planning verdict
incompatibleDo not plan a shared aquarium for this pair. Choose a different tank mate or maintain separate aquariums.
Angelfish and Cardinal Tetra receive a not recommended verdict from the current structured assessment. Angelfish is recorded as semi-aggressive with an aggression level of 5/10; Cardinal Tetra 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.
Angelfish has a recorded temperature range of 76–82°F and pH range of 6.5–7.5. Cardinal Tetra is recorded at 73–84°F and pH 5–7. Their shared planning window is 76–82°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.
Angelfish sets the larger listed base aquarium requirement at 29 gallons; the other listed minimum is 20 gallons. Angelfish is the larger adult by the recorded maximum, reaching 6 inches, compared with 2 inches. These figures are starting constraints, not a stocking-capacity calculation, because the complete group sizes and bioload still matter.
Angelfish is a calm species associated with the mid zone and moderate flow. Cardinal Tetra is calm, uses the mid zone, and has a moderate flow preference. Angelfish does not have a recorded minimum school larger than one, while cardinal tetra should be planned as a group of at least 8. The aquarium must support both social structures without forcing either species into insufficient space.
Angelfish is recorded as a omnivore with intermediate care, while Cardinal Tetra is a omnivore 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.
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 Angelfish and Cardinal Tetra.