Goldfish Rescue

A friend of mine has just bought a new house that came with an old sink in the garden with a lone fish in it which the previous occupants have left!

Its orange, perhaps 10-15cm long so I suspect a gold fish. Can't tell for definite because when she showed me it yesterday the water was so green and murky the fish was barely visible.

The new owners don't want to keep an outdoor fish so I offered to see if my parents would take him in their indoor tank (with filter). They have two similar sized fish in their already and just lost a 3rd due to old age.

They were more than happy to do so.

Having slept on it I've realised this won't be as easy as just emptying a new fish into the aquarium. Advice on what to do gratefully received.

Don't want to stress any of the fish involved.

Thank you.

Grant's Reply


An excellent decision not to just empty the fish into your parent's aquarium. It could have been a complete success, or an epic disaster with all the fish being lost!

With the change in environment, the new fish will need to adapt to new surroundings, new water parameters, new food and possibly new diseases.

So starting with the basics; size. You mention all fish will be approximately the same size. This is a good start.

I am assuming they are all a similar variety i.e. single tails. Mixing fancy varieties with single tail varieties leads to the single tailed fish getting fatter and fatter and the twin tailed varieties getting thinner.

Fish that have been in a closed body of water, (sink or aquarium), lose their immunity to some diseases. When a new fish is introduced into a new environment without being quarantined, it can introduce, or it can catch a disease it hasn't been exposed to before.

The new fish needs to be quarantined for a couple of weeks and treated for parasites.

The existing fish need to be treated for parasites at the same time. Use API General Cure which doesn't require the filter to be stopped, but any charcoal should be removed first.

When putting the new fish into quarantine using fresh new de-chlorinated water, do it slowly over an hour by slowly introducing new water into its container.

The other option is to use a water test kit to check that the new water pH is the same or higher than the water the fish is in.

Have a read of this page on how to introduce new fish into their new environment which is covered in some detail.

Comments for Goldfish Rescue

Average Rating starstarstarstarstar

Click here to add your own comments

Nov 04, 2022
200+ Goldfish require rehoming
by: Carl

I am required to rehome a pond containing over 200+ goldfish. I need to re-home these by end of Nov 2023.
They can only be rehomed to a location >1Km from an open watercourse and to an enclosed pond or Tanks. A health check has been completed and available upon request.
I am prepared to facilitate full cost of transfer to a suitable home.

Please contact me if this is of interest:
07392 082450

May 30, 2022
three goldfish
by: Aannmarie

I have three goldfish that are getting too big for their fish tank.Anyone looking for three healthy goldfish for their pond Please let me know.

Sep 12, 2019
by: Zee

I have 130+ gold fish i want to find a home for. Anyone with a pond will take but this would be a death sentence for them. Can anyone help?

Click here to add your own comments

Join in and write your own page! It's easy to do. How? Simply click here to return to Goldfish FAQs.