Compatibility Report
GuideMyTank compatibility analysis for American Flagfish and Bubble Eye Goldfish.
Planning verdict
incompatibleDo not plan a shared aquarium for this pair. Choose a different tank mate or maintain separate aquariums.
American Flagfish and Bubble Eye Goldfish receive a not recommended verdict from the current structured assessment. American Flagfish is recorded as semi-aggressive with an aggression level of 4/10; Bubble Eye Goldfish 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.
American Flagfish has a recorded temperature range of 64–78°F and pH range of 6.5–8. Bubble Eye Goldfish is recorded at 65–75°F and pH 7–8. Their shared planning window is 65–75°F for temperature and 7–8 for pH. A shared aquarium must stay inside the overlap rather than merely touching each species’ outer tolerance.
Bubble Eye Goldfish sets the larger listed base aquarium requirement at 30 gallons; the other listed minimum is 20 gallons. Bubble Eye Goldfish 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. Bubble Eye Goldfish is calm, uses the mid zone, and has a low flow preference. American Flagfish should be planned as a group of at least 2, while bubble eye goldfish 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 Bubble Eye Goldfish is a omnivore with advanced care. Their listed preferred tank styles are community and goldfish. 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 American Flagfish and Bubble Eye Goldfish.