Compatibility Report
GuideMyTank compatibility analysis for American Flagfish and Angelfish.
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.
American Flagfish and Angelfish receive a conditional verdict from the current structured assessment. American Flagfish is recorded as semi-aggressive with an aggression level of 4/10; Angelfish is recorded as semi-aggressive with an aggression level of 5/10. The recommendation is based on the combined water, space, behavior, grouping, and predation checks below rather than on species names alone.
American Flagfish has a recorded temperature range of 64–78°F and pH range of 6.5–8. Angelfish is recorded at 76–82°F and pH 6.5–7.5. Their shared planning window is 76–78°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.
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 2.5 inches. These figures are starting constraints, not a stocking-capacity calculation, because the complete group sizes and bioload still matter.
American Flagfish is a moderate species associated with the mid zone and low flow. Angelfish is calm, uses the mid zone, and has a moderate flow preference. American Flagfish should be planned as a group of at least 2, while angelfish does not have a recorded minimum school larger than one. The aquarium must support both social structures without forcing either species into insufficient space.
American Flagfish is recorded as a omnivore with intermediate care, while Angelfish is a omnivore with intermediate care. Their listed preferred tank styles are community and planted. 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 American Flagfish and Angelfish.