Compatibility Overview
Weather Loach and Yoyo Loach can potentially coexist, but the combination requires careful attention. Some combination of water parameter differences, size mismatch, or temperament issues make this pair challenging. A larger tank (minimum 40 gallons), dense planting, and close monitoring are essential.
| Factor | Weather Loach | Yoyo Loach | Verdict |
|---|---|---|---|
| Temperature | 59–72°F | 72–79°F | ⚠️ 72–72°F (narrow) |
| pH Range | 6.5–7.5 | 6.5–7.5 | ✅ 6.5–7.5 |
| Temperament | aggressive | semi | ❌ Risk |
| Adult Size | 3.9 in | 2.0 in | ✅ Similar |
| Min. Group | 1+ | 1+ | See below |
| Min. Tank Size | 40 gallons (for both species) | — | |
✅ Compatibility Positives
⚠️ Caution Points
Species Profiles
Weather Loach — Aquarium species
The Weather Loach, also known as the Weather Fish, is a popular addition to freshwater aquariums due to its peaceful nature and intriguing behavior. It has a slender, eel-like body with a translucent appearance and dark spots. These loaches are active and enjoy exploring their tank, making them a moderate activity level fish. They do not school and are gener
→ Full Weather Loach care guide
Yoyo Loach — Aquarium species
The Yoyo Loach is a popular freshwater species known for its striking black and white coloration. They are peaceful and make great community fish, though they may be shy and require a well-established tank with ample hiding spots. These loaches are moderately active and do well in a tank with plenty of room to swim. With proper care, they can live up to 5 ye
Frequently Asked Questions
Can Weather Loach live with Yoyo Loach?
With significant caution and a larger tank. Weather Loach and Yoyo Loach can potentially coexist, but the combination requires careful attention. Some combination of water parameter differences, size mismatch, or temperament issues make this pair challenging. A larger tank (minimum 40 gallons), dense planting, and close monitoring are essential.
What tank size do I need for Weather Loach and Yoyo Loach together?
A minimum of 40 gallons is recommended for keeping Weather Loach and Yoyo Loach together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Weather Loach and Yoyo Loach?
72–72°F (narrow)
Is a Weather Loach aggressive toward a Yoyo Loach?
Weather Loach is aggressive and Yoyo Loach is semi. Their preferred temperature ranges have little or no safe overlap.
Related Compatibility Guides
Compatibility score breakdown
The overall score is weighted across water chemistry, behavior, adult size, swimming zone, and social needs. A score is a planning aid—not a guarantee for individual fish.
| Factor | Score |
|---|---|
| Temperature | 0/100 |
| Ph | 100/100 |
| Temperament | 25/100 |
| Adult Size | 100/100 |
| Swim Zone | 68/100 |
| Social Needs | 92/100 |
Tank size scenarios
Use the scenario that matches the actual group sizes and temperament you plan to keep.
| Scenario | Tank | When it applies |
|---|---|---|
| Minimum viable | 40 gal | Only for the recommended minimum groups, mature filtration, and close monitoring. |
| Recommended community | 55 gal | Adds territory, swimming room, and a safer buffer for behavior. |
| Low-conflict setup | 75 gal | Best when keeping larger schools or reducing territorial pressure. |