Discus and Glowlight Tetra Compatibility Overview
Discus and Glowlight Tetra are generally not recommended to be housed together. The adult size gap creates a meaningful predation risk. Their ranges meet only at 82โ82ยฐF, which leaves no margin for a heater drifting or a warm room. Review the behavior and water details before deciding whether to attempt the pairing.
| Factor | Discus | Glowlight Tetra | Verdict |
|---|---|---|---|
| Temperature | 82โ88ยฐF | 75โ82ยฐF | โ ๏ธ 82โ82ยฐF (narrow) |
| pH Range | 5.0โ7.0 | 5.5โ7.5 | โ 5.5โ7.0 |
| Temperament | semi | peaceful | โ ๏ธ Monitor |
| Adult Size | 8 in | 1.6 in | โ 5ร difference |
| Min. Group | 5+ | 6+ | See below |
| Min. Tank Size | 100 gallons (for both species) | โ | |
Compatibility Positives
Incompatibility Reasons
Species Profiles
Discus โ Symphysodon spp.
The 'king of the aquarium' โ beautiful but demanding. Requires very warm, soft, acidic water that excludes most community fish.
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.
Frequently Asked Questions
Can Discus live with Glowlight Tetra?
Generally not recommended. Discus and Glowlight Tetra are generally not recommended to be housed together. The adult size gap creates a meaningful predation risk. Their ranges meet only at 82โ82ยฐF, which leaves no margin for a heater drifting or a warm room. Review the behavior and water details before deciding whether to attempt the pairing.
What tank size do I need for Discus and Glowlight Tetra together?
A minimum of 100 gallons is recommended for keeping Discus and Glowlight Tetra together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Discus and Glowlight Tetra?
82โ82ยฐF (narrow) โ inside Discus's 82โ88ยฐF and Glowlight Tetra's 75โ82ยฐF.
Is a Discus aggressive toward a Glowlight Tetra?
The adult size gap creates a meaningful predation risk.
Related Compatibility Guides
Tank Size for Discus and Glowlight Tetra
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. |