Compatibility Overview
Oscar and Yoyo Loach 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 | Oscar | Yoyo Loach | Verdict |
|---|---|---|---|
| Temperature | 74–81°F | 72–79°F | ✅ 74–79°F |
| pH Range | 6.0–8.0 | 6.5–7.5 | ✅ 6.5–7.5 |
| Temperament | aggressive | semi | ❌ Risk |
| Adult Size | 14 in | 2.0 in | ❌ 7× difference |
| Min. Group | 1+ | 1+ | See below |
| Min. Tank Size | 100 gallons (for both species) | — | |
✅ Compatibility Positives
❌ Incompatibility Reasons
Species Profiles
Oscar — Astronotus ocellatus
Intelligent but aggressive cichlids that will eat any fish small enough to fit in their mouth. Require large tanks (75+ gallons) and robust tank mates.
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 Oscar live with Yoyo Loach?
Generally not recommended. Oscar and Yoyo Loach 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 Oscar and Yoyo Loach together?
A minimum of 100 gallons is recommended for keeping Oscar and Yoyo Loach together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Oscar and Yoyo Loach?
74–79°F
Is a Oscar aggressive toward a Yoyo Loach?
Oscar is aggressive and Yoyo Loach is semi. The adult size gap creates a meaningful predation risk.
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 | 71/100 |
| Ph | 100/100 |
| Temperament | 25/100 |
| Adult Size | 8/100 |
| Swim Zone | 92/100 |
| 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 | 100 gal | Only for the recommended minimum groups, mature filtration, and close monitoring. |
| Recommended community | 150 gal | Adds territory, swimming room, and a safer buffer for behavior. |
| Low-conflict setup | 180 gal | Best when keeping larger schools or reducing territorial pressure. |