Goldfish – Comet 5cm
The comet goldfish is one of the oldest and best known variants of the common goldfish.
For anyone who hasn’t seen a well cared for goldfish, it may come as a surprise that they can grow to enormous sizes. Anyone who has ever had the chance to see my goldfish tank always assumes they are some type of koi, and are shocked when I tell them that they’re regular goldfish. (One of which was a rescue from a carnival.)
Because of their aquarium busting size, they should only be kept in the largest tanks, although they can be kept in smaller tanks while they’re still very young.
It’s important to remember that goldfish are cold-water fish, and will do best if kept in a cool room. They should never be kept in a heated tank or in an overly hot room.
| Specification | Value |
|---|---|
| Species | Comet Goldfish |
| Size | 5cm (approx.) |
| Water Temperature | Cold water (ideal: 15–20°C) |
| Environment | Aquarium, preferably large |
FAQ
What is the ideal water temperature for a comet goldfish?
Comet goldfish thrive in cold water, with an ideal temperature range of 15–20°C. They should never be kept in heated tanks or in rooms that are too warm.
Can a comet goldfish be kept in a small tank?
While young comet goldfish can be kept in smaller tanks, they should only be kept in large tanks as they grow. Their size can become aquarium-busting, so a large tank is recommended for long-term health.
Are comet goldfish similar to koi?
Comet goldfish are often mistaken for koi due to their large size and vibrant appearance. However, they are a type of common goldfish and are not koi.
Phil Thomson –
My comet goldfish has been in the tank for six months now. It’s active and colorful, and it’s a great addition to my home aquarium. I keep it in a large tank with plenty of plants and it seems very healthy. The size is manageable for a 5cm fish, and it’s a joy to watch.
Tracey Vaughan –
I bought this fish as a beginner and it’s surprisingly easy to care for. I keep it in a 100-liter tank with cool room temperature. It swims well and stays calm. Just make sure the water isn’t too warm.
Amanda Quinn –
The fish looks exactly like the photo. It’s vibrant and active. I was worried about its size, but it’s only 5cm now and seems to grow slowly. I keep it in a cool, well-ventilated room and it’s thriving.