Goldfish compatibility guide. 5 compatible tankmates + 5 species to avoid + temperament + size + water-chemistry guidance.
Best companions are other goldfish of similar size + body type. Mix fancy + fancy, single-tail + single-tail.
Coldwater bottom dweller, peaceful, eats leftover food.
Coldwater algae eater, peaceful, prefers cool fast-flow water.
Coldwater snail; large enough not to be eaten.
Coldwater schooling fish, peaceful, fits goldfish parameters.
Goldfish need 65-72°F; tropicals need 76-82°F. Mismatch kills both.
Plecos suck slime coat off goldfish at night. Kills goldfish slowly.
Aggressive + hot-water requirement.
Tropical + delicate fins.
Goldfish eat anything that fits in their mouth.
Use the stocking calculator to verify your specific plan. Browse stocking ideas by tank size for proven setups, or read the Goldfish care guide for full husbandry details.
Browse all tankmate guides.