Quick Stats
| Adult Size | 15–20 cm |
| Minimum Tank | 20 gal |
| Temperature | 15–22°C |
| pH Range | 7.0–8.4 |
| Hardness (GH) | 10–20 dGH |
| Difficulty | Medium |
| Temperament | Peaceful |
| Diet | Omnivore — goldfish pellets, blanched vegetables, earthworms |
| Schooling | Keep in pairs or groups of 3+ |
Tank Setup
The Goldfish (Fancy) (Carassius auratus) requires a minimum tank size of 20 gal. For a species this size, a larger tank is always better — more water volume means more stable parameters and a healthier environment.
Water parameters should be maintained within the following ranges: temperature 15–22°C, pH 7.0–8.4, and hardness 10–20 dGH. These fish are sensitive to water quality — test regularly and maintain pristine conditions.
Provide appropriate hiding places, a suitable substrate, and open swimming space to match the natural behaviour of this species.
Tank Mates
Goldfish (Fancy) are peaceful fish. They work well in community tanks with similarly-sized peaceful species.
Compatible tank mates include: Other Fancy Goldfish, Weather Loach (coldwater). Avoid housing with aggressive or much larger fish.
Schooling requirements: Keep in pairs or groups of 3+. Keeping them in adequate numbers is essential for their wellbeing.
Diet & Feeding
Goldfish (Fancy) are Omnivore. Feed a varied diet to ensure optimal health and colouration.
Omnivore — goldfish pellets, blanched vegetables, earthworms
Feed small amounts 1–2 times daily. Only provide what the fish can consume within 2–3 minutes to prevent overfeeding and water quality issues.
Common Health Issues
Like all aquarium fish, Goldfish (Fancy) can be susceptible to common diseases including ich (white spot disease), fin rot, and bacterial infections. This species can be sensitive — maintain excellent water quality to prevent health issues.
Prevention is always better than treatment. Maintain stable water parameters, avoid overfeeding, quarantine new fish before adding them to the main tank, and perform regular water changes. Test your water weekly and address any parameter spikes immediately.
If disease does occur, isolate affected fish in a quarantine tank and treat appropriately. Always research medication compatibility before use — some treatments are toxic to invertebrates and scaleless fish.
Breeding
Breeding Goldfish (Fancy) requires specific conditions and may be challenging for beginners.
Provide appropriate breeding conditions — planted areas with fine-leaved plants. Condition breeding pairs with high-quality foods before attempting to spawn them.
Research specific breeding requirements for this species before attempting it.
Frequently Asked Questions
What size tank does a Goldfish (Fancy) need?
A Goldfish (Fancy) needs a minimum tank size of 20 gal. However, larger is always better — more water volume means more stable water parameters and healthier fish.
Are Goldfish (Fancy) easy to keep?
Goldfish (Fancy) are rated as Medium difficulty. Some experience with aquarium water parameters is recommended before keeping this species.
What do Goldfish (Fancy) eat?
Goldfish (Fancy) are Omnivore. Feed a varied diet including goldfish pellets, blanched vegetables, earthworms.
Can Goldfish (Fancy) live with other fish?
Goldfish (Fancy) are peaceful. Compatible tankmates include: Other Fancy Goldfish, Weather Loach (coldwater). They work well in community tanks with similarly-sized peaceful fish.