Compatibility Overview
Koi and Nerite Snail 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 | Koi | Nerite Snail | Verdict |
|---|---|---|---|
| Temperature | 50–75°F | 65–85°F | ✅ 65–75°F |
| pH Range | 7.0–8.5 | 6.5–8.5 | ✅ 7.0–8.5 |
| Temperament | peaceful | peaceful | ✅ Compatible |
| Adult Size | 24 in | 1 in | ❌ 24× difference |
| Min. Group | 2+ | 1+ | See below |
| Min. Tank Size | 100 gallons (for both species) | — | |
✅ Compatibility Positives
❌ Incompatibility Reasons
Species Profiles
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.
Nerite Snail — Nerita spp.
Outstanding algae-eating snails that do not reproduce in freshwater. Extremely hardy and compatible with virtually all peaceful fish.
Frequently Asked Questions
Can Koi live with Nerite Snail?
Generally not recommended. Koi and Nerite Snail 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 Koi and Nerite Snail together?
A minimum of 100 gallons is recommended for keeping Koi and Nerite Snail together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Koi and Nerite Snail?
65–75°F
Is a Koi aggressive toward a Nerite Snail?
Koi is peaceful and Nerite Snail is peaceful. Koi requires cold water; Nerite Snail requires tropical water. These environments are incompatible.