Compatibility Report

Can Moonlight Gourami Live With Wrestling Halfbeak?

GuideMyTank compatibility analysis for Moonlight Gourami and Wrestling Halfbeak.

Planning verdict

caution

Conditional

Only plan this pair if every listed condition can be met, and have a separation plan if stress or aggression appears.

Data confidence: high
Assessment source: Structured data model
Data completeness: 100%

Blocking risks

No automatic safety blocker was found.

Conditions and cautions

One species may be semi-aggressive and require planning.
One species should be maintained in a proper school or group.
Tank size requirements differ slightly.
Water hardness preferences conflict.
GH or KH ranges do not overlap well.
A species needing stable water has only a narrow pH, GH, or KH overlap.
Breeding aggression can turn an otherwise workable pairing into a caution setup.

Supporting factors

Temperature ranges overlap well.
pH requirements overlap well.
No predation risk detected.

Moonlight Gourami profile Wrestling Halfbeak profile Methodology and limitations

Why This Pair Received Its Verdict

Moonlight Gourami and Wrestling Halfbeak receive a conditional verdict from the current structured assessment. Moonlight Gourami is recorded as peaceful with an aggression level of 2/10; Wrestling Halfbeak is recorded as semi-aggressive with an aggression level of 4/10. The recommendation is based on the combined water, space, behavior, grouping, and predation checks below rather than on species names alone.

Temperature ranges overlap well.
pH requirements overlap well.
One species may be semi-aggressive and require planning.
One species should be maintained in a proper school or group.

Water Parameter Overlap

Moonlight Gourami has a recorded temperature range of 77–86°F and pH range of 6–7.5. Wrestling Halfbeak is recorded at 75–82°F and pH 6.5–8. Their shared planning window is 77–82°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.

Aquarium Space and Adult Size

Moonlight Gourami sets the larger listed base aquarium requirement at 30 gallons; the other listed minimum is 20 gallons. Moonlight Gourami is the larger adult by the recorded maximum, reaching 6 inches, compared with 3 inches. These figures are starting constraints, not a stocking-capacity calculation, because the complete group sizes and bioload still matter.

Behavior and Social Requirements

Moonlight Gourami is a calm species associated with the top zone and low flow. Wrestling Halfbeak is calm, uses the top zone, and has a moderate flow preference. Moonlight Gourami does not have a recorded minimum school larger than one, while wrestling halfbeak should be planned as a group of at least 4. The aquarium must support both social structures without forcing either species into insufficient space.

Husbandry Fit

Moonlight Gourami is recorded as a omnivore with easy care, while Wrestling Halfbeak is a carnivore with advanced care. Their listed preferred tank styles are planted 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.

What Would Change the Decision?

Use these pair-specific boundaries before treating the verdict as an acceptable stocking plan.

Do not proceed unless one stable temperature and pH range can be maintained for both Moonlight Gourami and Wrestling Halfbeak; acclimation does not correct an incompatible long-term range.
Treat size, predation, and fin-damage warnings as stop conditions. Extra plants cannot reliably make an unsafe predator-to-prey or fin-target pairing safe.
Use broken sight lines and multiple retreats, then separate the pair if either species shows persistent chasing, hiding, clamped fins, or loss of feeding access.
Recalculate space using the full adult group sizes—not one specimen of each species—and reject the plan if either species must be understocked socially to fit.
Prepare a cycled backup or separation option before introduction; individual behavior can be less predictable than species-level records.

Aquarium Planning Checklist

Keep temperature within 77–82°F.
Keep pH within 6.5–7.5.
Use at least the larger 30-gallon base requirement before accounting for the complete stocking plan.
Moonlight Gourami does not have a recorded minimum school larger than one; wrestling halfbeak should be planned as a group of at least 4.
Provide a separation plan and monitor feeding, stress, chasing, damaged fins, and access to preferred habitat zones.

Final Recommendation

Only plan this pair if every listed condition can be met, and have a separation plan if stress or aggression appears.

Sources and Data Provenance

These references support the underlying species records used by this assessment. They do not necessarily evaluate this exact pair together.

my-fish.orgcare · medium confidence
fishbase.secare · medium confidence
fishbase.secare · medium confidence
en.wikipedia.orgtaxonomy · medium confidence
en.wikipedia.orgtaxonomy · medium confidence
en.wikipedia.orgtaxonomy · medium confidence

Read the full methodology and limitations

Report quality: supported
Analysis version: 2026.09.1
Species data updated: Jul 2, 2026
Review status: Structured automated assessment

Related Resources

Continue with the most relevant care and compatibility resources for Moonlight Gourami and Wrestling Halfbeak.