Compatibility Report
GuideMyTank compatibility analysis for Discus and Rainbow Shark.
Planning verdict
incompatibleDo not plan a shared aquarium for this pair. Choose a different tank mate or maintain separate aquariums.
No automatic safety blocker was found.
Discus and Rainbow Shark receive a not recommended verdict from the current structured assessment. Discus is recorded as peaceful with an aggression level of 2/10; Rainbow Shark 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.
Discus has a recorded temperature range of 82–86°F and pH range of 4.5–6.5. Rainbow Shark is recorded at 72–82°F and pH 6.5–7.5. Their shared planning window is 82–82°F for temperature and 6.5–6.5 for pH. A shared aquarium must stay inside the overlap rather than merely touching each species’ outer tolerance.
Discus sets the larger listed base aquarium requirement at 75 gallons; the other listed minimum is 55 gallons. Discus is the larger adult by the recorded maximum, reaching 8 inches, compared with 6 inches. These figures are starting constraints, not a stocking-capacity calculation, because the complete group sizes and bioload still matter.
Discus is a calm species associated with the mid zone and low flow. Rainbow Shark is moderate, uses the bottom zone, and has a moderate flow preference. Discus should be planned as a group of at least 6, while rainbow shark does not have a recorded minimum school larger than one. The aquarium must support both social structures without forcing either species into insufficient space.
Discus is recorded as a omnivore with advanced care, while Rainbow Shark is a omnivore with intermediate care. Their listed preferred tank styles are blackwater and rockwork. 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 Discus and Rainbow Shark.