Glowlight Tetra and Oscar Compatibility Overview
Glowlight Tetra and Oscar are generally not recommended to be housed together. The adult size gap creates a meaningful predation risk. Glowlight Tetra is peaceful and Oscar is aggressive. Expect chasing and fin damage unless the tank is oversized, heavily planted, and watched closely. Review the behavior and water details before deciding whether to attempt the pairing.
| Factor | Glowlight Tetra | Oscar | Verdict |
|---|---|---|---|
| Temperature | 75โ82ยฐF | 74โ81ยฐF | โ 75โ81ยฐF |
| pH Range | 5.5โ7.5 | 6.0โ8.0 | โ 6.0โ7.5 |
| Temperament | peaceful | aggressive | โ Risk |
| Adult Size | 1.6 in | 14 in | โ 9ร difference |
| Min. Group | 6+ | 1+ | See below |
| Min. Tank Size | 100 gallons (for both species) | โ | |
Compatibility Positives
Incompatibility Reasons
Species Profiles
Glowlight Tetra โ Hemigrammus erythrozonus
The Glowlight Tetra is a vibrant, peaceful community fish known for its silver body and bright red-gold highlights. It thrives in a well-planted tank with plenty of swimming space and a gentle water flow. These tetras are easy to care for and are suitable for beginners.
โ Full Glowlight Tetra care guide
Oscar โ 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.
Frequently Asked Questions
Can Glowlight Tetra live with Oscar?
Generally not recommended. Glowlight Tetra and Oscar are generally not recommended to be housed together. The adult size gap creates a meaningful predation risk. Glowlight Tetra is peaceful and Oscar is aggressive. Expect chasing and fin damage unless the tank is oversized, heavily planted, and watched closely. Review the behavior and water details before deciding whether to attempt the pairing.
What tank size do I need for Glowlight Tetra and Oscar together?
A minimum of 100 gallons is recommended for keeping Glowlight Tetra and Oscar together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Glowlight Tetra and Oscar?
75โ81ยฐF โ inside Glowlight Tetra's 75โ82ยฐF and Oscar's 74โ81ยฐF.
Is a Glowlight Tetra aggressive toward a Oscar?
The adult size gap creates a meaningful predation risk.
Related Compatibility Guides
Tank Size for Glowlight Tetra and Oscar
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 | 220 gal | Best when keeping larger schools or reducing territorial pressure. |