[bruce023]

Hi

Grateful if you could advise please. Most of my goldfish swim upside down. And when I'm cleaning the tank, should I be able to change all the water tank?

Thanks

[shazamataz]

When doing a water change you should never change more than 50% of the water, less is recommended.

The water in the tank grows good bacteria which the fish need, if you remove all of the water then the cycle has to start all over again.

I am far from a fish expert but usually swimming upside down means something do to with their swim bladder.
Green peas are the easiest way to help treat it.

[joyluo1999]

I'm thinking your fish have a problem with their swimbladder.
Green peas work well but sometimes the fish don't like to eat them.

Good Luck!:)

Joy

[Alty]

I'm thinking your fish have a problem with their swimbladder.
Green peas work well but sometimes the fish don't like to eat them.

Good Luck!:)

Joy

Joy, just repeating what others have already said isn't helpful.

Please only post if you have something new to add.

Thanks.

[AuntSwee]

Just an example of what happens when you change all the water in the tank. I did that not knowing that you are not suppose to do that and killed almost all of my fish. I didn't just do that to one tank I did it to all 3 tanks, I now have only one tank as the fish are gone and now I have to spend the money to replace all the fish.
Now I know that you are only to do a 10% change at the most once a week, every 2 weeks is better. Once every 6 months do a 50% change, to keep a very healthy tank. I have 6 more months to go before I can add any more fish, bummer. Also in order to have a healthy tank you need waste eaters. They keep your tank clean for you, to a point you still have to vacuum 10% of the water out.

[Juicy Buns]

As mentioned, swim bladder problems are a common cause of floating fish, especially in fancy varieties with deep bodies, but a swim bladder rarely malfunctions for no reason. High nitrate levels are the main cause of these problems. This suggests to me that your tank may have cycled but you're not doing enough water changes. Once you have enough beneficial bacteria in your filter, the ammonia your fish excrete will be converted to nitrite, then to nitrate and it's this nitrate that we aim to remove in weekly water changes.
25% weekly is the general rule of thumb but to remove the high levels you already have in your tank, I'd do a 50% change this week and 25% every week thereafter. Fasting for a day and feeding shelled peas will definitely help in the short term too.

[hheath541]

You can get strips to test the ph and nitrate levels in the tank at pretty much any store that sells pet supplies. You can also usually find books on goldfish care.