Q&A: Will 3 goldfish be enough to feed beneficial bacteria in a 55 gallon tank?

Question by FishMan: Will 3 goldfish be enough to feed beneficial bacteria in a 55 gallon tank?
Is it OK to keep 3 goldfish in a 55 gallon tank or is it understocking? Will it to be enough to keep the beneficial bacteria alive?
They are fancies.

Best answer:

Answer by Jessica M
If it’s goldfish it more than likely will be enough wastes considering how much they poop.

If you want you can put 1 more goldfish in there if you like.

What do you think? Answer below!

Posted in Pet Health Media | Tagged , , , , , , | 7 Comments

7 Responses to Q&A: Will 3 goldfish be enough to feed beneficial bacteria in a 55 gallon tank?

  1. Ronaldinho #2 says:

    yes it will be enough to keep the bacteria alive but don’t add anymore fish cuz a full sized goldfish need at least 30 gallons each.
    Good Luck

  2. John G says:

    I think I remember the rule of one goldfish needs about 8 gallons of water. So you’ll probably be okay and can even up it, though that depends how big the goldfish is. I was thinking the size you get from the fair. He he.

  3. Ianab says:

    The amount of bacteria will adjust to match the amount of fish in the tank.

    So as long as there is any number of fish, there will be some bacteria to match and the tank will stay cycled.

    The only thing to watch is that the cycle will reduce to a lower level, so you need to take care when adding more fish. Build up the fish numbers slowly over a few weeks to allow the cycle to build up again.


  4. Dark Ryok says:

    What kind of goldfish? You dont realize how large they get do you? 3 fancy goldfish in a 55 gallon would be perfectly fine. But 3 comets/commons would need over around 90-100 gallons minimum.

    These are large fish that produce alot of waste.

  5. REB3L says:

    It depends on the size of the fish. I would suggest you to your local pet supplies carrier and buy a bottle of bacteria solution. its like the natural bacteria but you can add the amount to help what your goldfish are doing. I hope this helps.

  6. Jeff says:

    The site below has details on how to cycle your tank.

    Short answer: No, there is no way to understock. The benign bacteria that make up your biological filter will colonize your tank even if you only put one fish in there, and putting multiple fish in will probably not make a noticeable difference.

    So long as your water is dechlorinated, you don’t need to do anything but introduce the initial bacteria. These bacteria are in everything; the fish, live plants…even dirt. They aren’t in tap water because the chlorine in it kills them. But so long as there is no chlorine present in the water, the bacteria are very prolific and will not need any help.

    The only real way to fasttrack the process is to get water from a tank that is already cycled and put it in your tank. Pet stores sell products in bottles that supposedly do the same thing, but I have never noticed a difference. What you are doing now will work fine. Just make sure to do water changes at least every other day for a couple weeks until the bacteria colonize the tank.

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