The goldfish is the pet almost every family thinks they understand, and almost nobody does. A goldfish is not a two-year bowl fish — it is a cold-water pond animal that grows to the size of your hand, makes a great deal of mess, and can easily outlive a dog. Given a proper filtered tank and honest weekly cleaning, a goldfish is a hardy, funny, long-lived pet that will greet you at the glass for a decade or more.
Is a goldfish a good pet for kids?
Quick answer: Goldfish are great pets for most kids. The goldfish is the pet almost every family thinks they understand, and almost nobody does.
- 👍 Best for: hardy and forgiving of beginner mistakes, genuinely interactive; they learn feeding time
- 👀 Keep in mind: needs a big tank, not a bowl
- ⏳ Lifespan: 10–20 years
- 💲 Ongoing cost: about $15–$40/mo (setup & vet extra)
📋 Goldfish at a glance
Should I get a goldfish?
💚 Why you'll love a goldfish
- Hardy and forgiving of beginner mistakes
- No heater needed — they like room-temperature water
- Genuinely interactive; they learn feeding time
- A second goldfish costs almost nothing to feed
⚠️ Things to know
- Needs a big tank, not a bowl
- Very messy — they need a strong filter
- Gets much bigger than families expect
- A 10–20 year commitment from a $3 fish
The honest answer: Yes, but never as the cheap starter fish it's sold as; this is a decade-long, tank-sized pet whose equipment costs many times more than the animal.
👍 Get one if…
- You have room for twenty gallons, then more
- Your kids like siphoning and scrubbing, not just feeding
- You're happy to keep two, never just one
- You genuinely want a ten-year-plus pet
👎 Think again if…
- You're bringing home a fairground fish on impulse
- You want a pet for two or three years
- You're putting a common or comet in a tank
- You can't face a weekly half-tank change
✅ Am I ready for a goldfish?
Wanting one and being ready for one are different questions. These are the ones worth answering honestly before you decide — there are no wrong answers, and a "not yet" is a perfectly good result.
Big surprise: a goldfish can live 10–20 YEARS. That's longer than a rabbit. Are you in for the long haul?
- Yes — I'll still be caring for it as a teenager
- I hadn't realised it was that long
- I was thinking a year or two
If that one gave you pause: Talk as a family about who looks after the tank in 5 or 10 years — including if you move house or go to college.
Goldfish grow BIG — a common goldfish reaches the length of a school ruler. Do you have room for a 20-gallon-plus tank?
- Yes, we've got space for a real tank
- Maybe — we'd have to measure
- I was picturing a bowl on my desk
If that one gave you pause: Measure the spot with a grown-up before you buy. Start at 20 gallons for one goldfish and add about 10 gallons per extra fish.
How to care for your Goldfish
Goldfish care in depth
The bowl is the myth that kills goldfish
A goldfish bowl is the most recognisable pet in the world and one of the worst homes in the hobby. A bowl has no filter, a small surface for oxygen, and not enough water to dilute waste — and goldfish produce a lot of waste. The ammonia that builds up burns their gills, which is why so many "starter" goldfish die in weeks and families conclude goldfish are fragile. They are not; they are just kept badly. A sensible starting point is a filtered 20-gallon tank for the first goldfish, plus around 10 gallons for each additional fish. Give them the water and goldfish become nearly unkillable.
They shouldn't be alone in it, either. Goldfish are sociable, and Switzerland's animal welfare rules treat them as a group species that should be kept in company — the same thinking behind its rules for guinea pigs, budgies, and rats. A second goldfish costs almost nothing to feed; it just needs the extra water.
Yours is not a temporary fish
Two numbers surprise every new goldfish family. The first is size: a common or comet goldfish — the plain orange ones from the fair — reaches 10 to 12 inches, the length of a school ruler, and really belongs in a pond. The rounder "fancy" varieties like fantails and orandas stay smaller, around 6 to 8 inches, which is why they are the better choice for a tank. The second is time: a well-kept goldfish lives 10 to 20 years. That $3 fish is a longer commitment than a rabbit and about the same as a dog, so it is worth deciding as a family rather than on the way out of a fairground.
Cold water, big filter, big water changes
Goldfish care is simple but not small. They are cold-water fish and need no heater — ordinary room temperature, roughly 65–75°F, suits them, and a heated tropical tank runs warmer than they want. Because they are messy, buy a filter rated for a tank bigger than yours and change 30–50% of the water every week with dechlorinated water. Feed sinking pellets rather than floating flakes, since gulping air at the surface contributes to the swim-bladder problems fancy goldfish are prone to, and offer a blanched pea now and then. Do that and the hardest part of goldfish keeping is finding somewhere to put the tank.
Goldfish are hardy, funny, and can live 10–20 years — but only in a proper filtered tank, never a bowl. Get the tank running before you bring a fish home and you'll have a pet for a decade.
✅ Before you bring a goldfish home
🗓️ Your routine — easy chores to remember
- Feed sinking pellets — only what they finish in a minute
- Check everyone is swimming normally
- Glance at the water clarity
- Change 30–50% of the water
- Vacuum the gravel
- Test ammonia, nitrite, and nitrate
- Offer a blanched pea as a treat
- Rinse filter media in old tank water
- Check the filter flow hasn't dropped
- Look at how much they've grown — do they need a bigger tank?
💰 Monthly cost: Low–medium: the fish is a few dollars, but a big tank and a strong filter are the real spend.
🤩 Fun facts about your Goldfish
The oldest goldfish on record lived to 43 years old.
❓ Common questions about goldfish
How much does a goldfish cost per month?
Plan on roughly $15–$40 per month for food and supplies. Low–medium: the fish is a few dollars, but a big tank and a strong filter are the real spend.
Are goldfish good pets for kids?
Yes! Goldfish rate 4/5 for kid-friendliness. Hands-off. Goldfish are watchers' pets, but they are bold ones — most swim straight up to say hello.
How long do goldfish live?
Goldfish typically live 10–20 years. Make sure your family is ready for that commitment before bringing one home.
Are goldfish allergy-friendly?
Goldfish produce no fur, feathers, or dander, which makes them a safe choice for families with fur allergies.
Should I get a goldfish?
Yes, but never as the cheap starter fish it's sold as; this is a decade-long, tank-sized pet whose equipment costs many times more than the animal. Get one if: You have room for twenty gallons, then more; Your kids like siphoning and scrubbing, not just feeding; You're happy to keep two, never just one; You genuinely want a ten-year-plus pet. Think again if: You're bringing home a fairground fish on impulse; You want a pet for two or three years; You're putting a common or comet in a tank; You can't face a weekly half-tank change.
How big do goldfish get?
Much bigger than most families expect. Common and comet goldfish reach 10–12 inches and are really pond fish, while fancy varieties like fantails and orandas stay around 6–8 inches. A goldfish does not stay small because its tank is small — it just becomes unhealthy.
Can a goldfish live in a bowl?
No. A bowl has no filter, little oxygen surface, and far too little water to dilute the waste a goldfish produces, so ammonia builds up and damages the gills. Plan on a filtered tank of at least 20 gallons for the first goldfish and about 10 more for each extra — and since goldfish do better with company, 30 gallons is the honest starting size.
Do goldfish need a heater?
No — goldfish are cold-water fish. Ordinary room temperature of about 65–75°F suits them, and a heated tropical tank runs warmer than they want, speeding up their metabolism.
How long do goldfish live?
A properly housed goldfish commonly lives 10 to 20 years, and the record holder reached 43. The two-year goldfish is a symptom of bowl-keeping, not the natural lifespan.
🎬 Goldfish care videos
Watch beginner-friendly care videos for your goldfish.
▶ Watch Goldfish care videos on YouTube📚 Where this comes from
We check our care advice against vets, animal charities, and government health guidance. Here is what this page is built on.
Vets, charities & official guidance
- How should I care for my goldfish? — RSPCA Australia
- Aquarienfische — Swiss Federal Food Safety and Veterinary Office
- What to feed your fish — RSPCA
Keeper & species-community guides
Checked August 2026. These are other people’s websites, and none of it replaces your own vet — if a pet seems unwell, call one.
