Explore all goldfish & koi in our database. Browse detailed care guides, compatibility information, and species data to find the perfect fish for your aquarium.
Carassius auratus
One of the most commonly kept and misunderstood fish in the hobby. Single-tailed goldfish (Comets, Commons, Shubunkins) are fast-growing, highly active coldwater fish that produce enormous amounts of waste. They are best suited for ponds or massive aquariums. They will uproot plants, sift substrate constantly, and eat anything that fits in their mouths.
Cyprinus rubrofuscus
Koi are large, ornamental varieties of the Amur carp. They are massive, long-lived pond fish that produce an extreme amount of waste. Highly social and intelligent, they can learn to recognize their owners. Due to their immense adult size, they are entirely unsuitable for indoor aquariums and require a very large pond with heavy filtration for their adult life.
