Compatibility Report

Can Pea Puffer Live With Weather Loach?

GuideMyTank compatibility analysis for Pea Puffer and Weather Loach.

Planning verdict

incompatible

Not recommended

Do not plan a shared aquarium for this pair. Choose a different tank mate or maintain separate aquariums.

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

Blocking risks

One species is best planned as a species-only setup.
Specialist tank style requirements need careful matching.

Conditions and cautions

Preferred temperature ranges differ, but the broader care ranges allow a narrow managed compromise.
One species may be semi-aggressive and require planning.
One species requires a significantly larger aquarium.
Freshwater puffers are specialist fin-nipping hunters and are poor community tankmates.

Supporting factors

pH requirements overlap well.
Both species have compatible schooling or group behavior.
No predation risk detected.

Pea Puffer profile Weather Loach profile Methodology and limitations

Why This Pair Received Its Verdict

Pea Puffer and Weather Loach receive a not recommended verdict from the current structured assessment. Pea Puffer is recorded as semi-aggressive with an aggression level of 5/10; Weather Loach 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.

Preferred temperature ranges differ, but the broader care ranges allow a narrow managed compromise.
pH requirements overlap well.
One species may be semi-aggressive and require planning.
Both species have compatible schooling or group behavior.

Water Parameter Overlap

Pea Puffer has a recorded temperature range of 74–82°F and pH range of 6.8–8. Weather Loach is recorded at 50–77°F and pH 6.5–8. Their shared planning window is 74–77°F for temperature and 6.8–8 for pH. A shared aquarium must stay inside the overlap rather than merely touching each species’ outer tolerance.

Aquarium Space and Adult Size

Weather Loach sets the larger listed base aquarium requirement at 55 gallons; the other listed minimum is 10 gallons. Weather Loach is the larger adult by the recorded maximum, reaching 12 inches, compared with 1.4 inches. These figures are starting constraints, not a stocking-capacity calculation, because the complete group sizes and bioload still matter.

Behavior and Social Requirements

Pea Puffer is a moderate species associated with the mid zone and moderate flow. Weather Loach is active, uses the bottom zone, and has a low flow preference. Pea Puffer should be planned as a group of at least 6, while weather loach should be planned as a group of at least 3. The aquarium must support both social structures without forcing either species into insufficient space.

Husbandry Fit

Pea Puffer is recorded as a carnivore with advanced care, while Weather Loach is a omnivore with intermediate care. Their listed preferred tank styles are species_only 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 Pea Puffer and Weather Loach; 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.
A different tank mate is the preferred decision for this pair. Attempting the combination transfers the identified risk to the animals rather than resolving it.

Aquarium Planning Checklist

Keep temperature within 74–77°F.
Keep pH within 6.8–8.
Use at least the larger 55-gallon base requirement before accounting for the complete stocking plan.
Pea Puffer should be planned as a group of at least 6; weather loach should be planned as a group of at least 3.
Choose separate aquariums or a different tank mate instead of attempting to manage a known blocking risk.

Final Recommendation

Do not plan a shared aquarium for this pair. Choose a different tank mate or maintain separate aquariums.

Sources and Data Provenance

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

fishdb.sinica.edu.twcare · medium confidence
fishbase.secare · medium confidence
thesprucepets.comcare · medium confidence
en.wikipedia.orgtaxonomy · medium confidence
en.wikipedia.orgtaxonomy · medium confidence
en.wikipedia.orgtaxonomy · medium confidence
es.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 Pea Puffer and Weather Loach.