Compatibility Report
GuideMyTank compatibility analysis for Harlequin Rasbora and Neon Tetra.
Planning verdict
compatibleThis pair is a reasonable starting point when both species receive their required tank size, group size, water conditions, and routine care.
No automatic safety blocker was found.
Harlequin Rasbora and Neon Tetra receive a recommended verdict from the current structured assessment. Harlequin Rasbora is recorded as peaceful with an aggression level of 1/10; Neon 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.
Harlequin Rasbora has a recorded temperature range of 73–82°F and pH range of 6–7.5. Neon Tetra is recorded at 70–81°F and pH 6–7.5. Their shared planning window is 73–81°F for temperature and 6–7.5 for pH. A shared aquarium must stay inside the overlap rather than merely touching each species’ outer tolerance.
Harlequin Rasbora sets the larger listed base aquarium requirement at 20 gallons; the other listed minimum is 10 gallons. Harlequin Rasbora is the larger adult by the recorded maximum, reaching 2 inches, compared with 1.5 inches. These figures are starting constraints, not a stocking-capacity calculation, because the complete group sizes and bioload still matter.
Harlequin Rasbora is a active species associated with the mid zone and moderate flow. Neon Tetra is moderate, uses the mid zone, and has a moderate flow preference. Harlequin Rasbora should be planned as a group of at least 8, while neon tetra should be planned as a group of at least 6. The aquarium must support both social structures without forcing either species into insufficient space.
Harlequin Rasbora is recorded as a omnivore with easy care, while Neon Tetra is a omnivore with easy care. Their listed preferred tank styles are blackwater 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.
This pair is a reasonable starting point when both species receive their required tank size, group size, water conditions, and routine care.
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 Harlequin Rasbora and Neon Tetra.