Goldfish help!

[limnologist]

5 months without a water change on a small tank with a goldfish will have Nitrate levels so high it will affect the fish... and that's on a cycled tank with 0 levels of Ammonia or Nitrites !

I guess really it depends on how many water plants you have and how much water you replace when it evaporates. I have natural tanks with plants, very few creatures, and no filtration and they can last a whole year without a water change.

[Tomato Frog]

I just wanted to chip in here.. your set up for the fish is okay for now, but basically you will want a 29 gal tank for your gold fish at the smallest as soon as you can get one, and I would always recommend getting a larger tank if you have the option to. As for housing goldfish with other fish from my experience you should only house them with other goldfish, koi, or shubunkin of a similar size. Some people do have luck putting them with other fish, but I would not risk it, most other fish need a heater anyways and a goldfish WILL eat any other fish small enough to fit in it's mouth. Now with water changes it really depends on tank size, amount of occupants, and if you have a proper filter, but most people do water changes of 1/4 to 1/3 of the water every 2 weeks to a month. I hope this was helpful for you, and the best of luck with your fish

- Dani

[Fbt123]

Once the goldfish reaches 4 inches in a few months i will put him in the pond. This is not a permanent tank that hes going into

[Fbt123]

Ok, goldie has gotten worse. Hes git loads more white dots on his body and tail, but u can only see them from an angle on his body. He is swimming around loads but hes got more spots which is bad