DifficultyBeginner-Intermediate
Temperature18-24 C
pH7.0-8.0
GH8-15 dGH
KH5-12 dKH
TDS200-300 ppm
Min Tank Size80+ litres (pond for koi)
DietOmnivorous — sinking or floating pellets formulated for goldfish/koi. Supplement with peas, blanched vegetables, and occasional frozen foods.
CompatibilityPeaceful coldwater fish. Goldfish should not be kept with tropical fish. Koi need pond environments. Compatible with other goldfish varieties and coldwater species.
SetupSetting up a goldfish tank:Coldwater Setup
Goldfish do NOT need heaters — they prefer 18-24C. They produce more waste than tropical fish, so over-filtration is essential.Tank Size
Goldfish need large tanks. A single fancy goldfish needs 80L minimum. Comets need 150L+ as they grow large.Filtration
Strong filtration rated for 2-3x your tank volume. Goldfish are messy.Substrate
Smooth gravel or sand. Goldfish like to sift through substrate.Koi
Koi are pond fish only. They grow to 60cm+ and need large, well-filtered ponds.
Care LevelGoldfish care:Water Changes
30-50% weekly — they produce a lot of waste.Feeding
Goldfish will overeat. Feed small portions twice daily, what they can consume in 2 minutes.Health
Swim bladder issues from overeating. Ich from temperature fluctuations. Goldfish are coldwater — don't add them to heated tropical tanks.Pond Care
Koi ponds need seasonal maintenance, including winter preparation and spring cleaning.
Please ensure you can provide a suitable, cycled tank before ordering. Young bettas may mature after arrival.
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