Not recommended — a goldfish (fancy) and discus are a risky mix.
Temperature clash — the goldfish (fancy) (65–75°F) and discus (82–88°F) don't share a safe range.
pH preferences overlap (7–7) — easy to keep both comfortable.
Plan on at least 55 gallons for the pair (the larger of their two minimums).
Can a goldfish (fancy) and discus live together?
Not recommended — a goldfish (fancy) and discus are a risky mix. Minimum tank for the pair is about 55 gallons.