Poor pairing in a typical community
Their preferred temperature ranges do not overlap.
Practical response: Choose species with a genuine long-term temperature overlap.
Neon Tetra
- Adult size
- 4 cm / 1.6 in
- Tank reference
- 40+ L / 10.6+ US gal
- Group
- 8+
- Zone
- mid
- Temperature
- 20–26°C / 68–78.8°F
Discus
- Adult size
- 16 cm / 6.3 in
- Tank reference
- 250+ L / 66+ US gal
- Group
- 5+
- Zone
- mid
- Temperature
- 28–31°C / 82.4–87.8°F
Water parameter overlap
Behavior and space
A classic schooling tetra that is most confident in a proper group and subdued community settings. Large warm-water cichlids usually kept in groups; stable water and low-stress tankmates are essential.
A compatibility answer should also consider the actual tank dimensions, number of each fish, filtration, planting and other occupants. Two species can be reasonable together in a long, structured aquarium yet become a poor pairing when compressed into a small footprint.
Common questions
Can Neon Tetra live with Discus?
The StockingLab verdict is avoid: Their preferred temperature ranges do not overlap.
Do their temperatures overlap?
No shared preferred range.
Should I trust compatibility calculators completely?
No. Individual behavior, sex ratios, breeding condition, aquascape and tank size can change the outcome. Use the result to identify risks, then verify care requirements before purchase.