What is best tank size for my goldfish?

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What is the best size?

  • Keep in the 5 gallon tank

    Votes: 0 0.0%
  • Keep in the 5 gal but add more water

    Votes: 0 0.0%
  • 10 gallons

    Votes: 1 11.1%
  • 15 gallons

    Votes: 2 22.2%
  • 20 gallons ( it will be hanging off the edge by about an inch)

    Votes: 7 77.8%
  • 30 gallon ( hanging of the edge by about 6 inches)

    Votes: 0 0.0%

  • Total voters
    9

Honey Fish

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I have a goldfish who now has been for 4 years happy In a 5 gallon tank (but probably 4.5 gal of water) so I heard I need to move him a 3 inch long goldfish into a larger tank now a have in length 39 inches to spare in width I have 8-9 spare inches what tank size should I move to I only really have the room for maybe a 15 at most what should I get
 

Sgooosh

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I have a goldfish who now has been for 4 years happy In a 5 gallon tank (but probably 4.5 gal of water) so I heard I need to move him a 3 inch long goldfish into a larger tank now a have in length 39 inches to spare in width I have 8-9 spare inches what tank size should I move to I only really have the room for maybe a 15 at most what should I get
Goldfish grow Huge!
yes!
what type of goldfish do you have op?
if its a fancy then 20 gallons is ok i guess
but id go for a 50 so it can have friends idk
 

anewbie

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If it has been there for 4 years i'd just leave it; it is likely stunted and moving it won't change that. Being stunted means not only that it will stay small but its organs have been damaged significantly shortening the life span.
 

wasmewasntit

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An absolute minimum of 20 gallons and better to have 30+ gallons per individual adult goldfish....since they are possibly the messiest fish on the planet, the bigger is definitely the better to assist in waste control

After 4 years, yours would be an adult. And as has already been said, it will be severely stunted in such a small aquarium for so long.

With regard to their messy behaviour, an aquarium as small as yours, you would need to be doing at least 50% to 75% water changes 3 times a week to prevent ammonia poisoning, and a painful death.

If unable to give the fish a more appropriate sized aquarium.....get a decent sized pond in the back garden for it to live in comfortably
 

Essjay

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Please read this
 

Bruce Leyland-Jones

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Whilst it is true that your goldfish may be a stunted adult by now, it would certainly appreciate a bigger tank and I suspect you'll notice a positive difference in behaviour.
Also, the time will come when your goldfish is no more...the bigger the tank you have, the more options you will have for filling it.
 
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Honey Fish

Honey Fish

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An absolute minimum of 20 gallons and better to have 30+ gallons per individual adult goldfish....since they are possibly the messiest fish on the planet, the bigger is definitely the better to assist in waste control

After 4 years, yours would be an adult. And as has already been said, it will be severely stunted in such a small aquarium for so long.

With regard to their messy behaviour, an aquarium as small as yours, you would need to be doing at least 50% to 75% water changes 3 times a week to prevent ammonia poisoning, and a painful death.

If unable to give the fish a more appropriate sized aquarium.....get a decent sized pond in the back garden for it to live in comfortably
I live in a small apartment no room for a pond
 
G

Guest14017

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He would be stunted by the small tank as many have said. He won't grow much beyond this point regardless of the size aquarium he is put into, so he doesn't need a very large tank.

With a 4 year old tank - ammonia poisoning is not likely. Nitrate poisoning is a bigger threat. Also, the fish is small and likely not fed much, so he probably doesn't need multiple 75% changes per week. For many, this is impractical anyway.

Stunting in goldfish does NOT necessarily affect their health or lifespan. Many, many small or stunted fish live perfectly normal lifespans and are perfectly healthy, they're just small. The oldest recorded goldfish were all stunted little runts who lived in tanks smaller than 10 gallons their entire lives.

This is NOT to say that I advocate for small tanks for goldfish, as they kill a LOT fish by ammonia poisoning as the tanks cannot handle the waste. That said - fish that aren't killed by such poisoning and are tough enough to survive it or owners who keep the tank fairly clean despite the size often have small healthy fish for many years.

With that said - a bigger tank would probably be more enjoyable for him. Get the largest tank you can and move the current filter over to that tank, and keep doing what you've been doing.
 

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