Not recommended — a neon tetra and discus are a risky mix.
Temperature clash — the neon tetra (70–81°F) and discus (82–88°F) don't share a safe range.
pH preferences overlap (6–7) — easy to keep both comfortable.
The discus is big and predatory enough to eat the neon tetra — likely a meal, not a tankmate.
Both are shoaling species — keep each in its own group of 6+ for calm, confident fish.
Plan on at least 55 gallons for the pair (the larger of their two minimums).
Can a neon tetra and discus live together?
Not recommended — a neon tetra and discus are a risky mix. Minimum tank for the pair is about 55 gallons.