Compatibility Overview
Dwarf Gourami and Koi are generally not recommended to be housed together. The issues listed above — whether water parameter incompatibility, predation risk, or aggression — create conditions where one or both fish are likely to suffer harm or chronic stress.
| Factor | Dwarf Gourami | Koi | Verdict |
|---|---|---|---|
| Temperature | 72–82°F | 50–75°F | ⚠️ 72–75°F (narrow) |
| pH Range | 6.0–7.5 | 7.0–8.5 | ⚠️ 7.0–7.5 (narrow) |
| Temperament | semi | peaceful | ⚠️ Monitor |
| Adult Size | 3.5 in | 24 in | ❌ 7× difference |
| Min. Group | 1+ | 2+ | See below |
| Min. Tank Size | 100 gallons (for both species) | — | |
✅ Compatibility Positives
❌ Incompatibility Reasons
Species Profiles
Dwarf Gourami — Trichogaster lalius
Colourful labyrinth fish that is generally peaceful but can be territorial toward similar species. Susceptible to Dwarf Gourami Iridovirus.
→ Full Dwarf Gourami care guide
Koi — Cyprinus rubrofuscus
Large pond fish that require hundreds of gallons and cool water. Will eat any fish small enough to fit in their mouth.
Frequently Asked Questions
Can Dwarf Gourami live with Koi?
Generally not recommended. Dwarf Gourami and Koi are generally not recommended to be housed together. The issues listed above — whether water parameter incompatibility, predation risk, or aggression — create conditions where one or both fish are likely to suffer harm or chronic stress.
What tank size do I need for Dwarf Gourami and Koi together?
A minimum of 100 gallons is recommended for keeping Dwarf Gourami and Koi together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Dwarf Gourami and Koi?
72–75°F (narrow)
Is a Dwarf Gourami aggressive toward a Koi?
Dwarf Gourami is semi and Koi is peaceful. Dwarf Gourami requires tropical water; Koi requires cold water. These environments are incompatible.