Not recommended — a goldfish (fancy) and dwarf gourami are a risky mix.
Temperature clash — the goldfish (fancy) (65–75°F) and dwarf gourami (77–82°F) don't share a safe range.
pH preferences overlap (7–7.5) — easy to keep both comfortable.
Plan on at least 20 gallons for the pair (the larger of their two minimums).
Can a goldfish (fancy) and dwarf gourami live together?
Not recommended — a goldfish (fancy) and dwarf gourami are a risky mix. Minimum tank for the pair is about 20 gallons.