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I have had 2 goldfish for 2 years in my aquarium. This one was good last night. I don't know what happened today it is somehow floating on side with little movement, like sleeping. I put it outside of aquarium with filtered water now. When I bring my finger near it, it moves a bit, but very slowly, which is sad.

I didn't change the aquarium water for a while (maybe a year - my impression is they enjoy dirtier water, like pods - as you see it was full of their poop). But if it was for the water, the other one should have got sick as well.

What happened? Is she dying?

UPDATE 1 (1st week):

After a few hours of putting it separately in that bowl with fresh filtered water and a bit higher temperature, she got better now and swims. But the cause is still unknown to me. I changed the aquarium water and will get them back to it after a few days.

UPDATE 2 (2nd week):

After a week and a few days back in aquarium, I see the same thing happening. I got her back to a bowl now. I see her left side is always up when tilted (like this photo above) and when she swims, she gets upside down and has no balance. Is it swim bladder? I gave her pea pieces, but how much should I give her? And does it cure her?

enter image description here

UPDATE 3:

Unfortunately she died, which is incredibly sad. I performed an autopsy to realize what was wrong. Here are two photos (viewer discretion advised). What was wrong?

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    what is the readings of your latest watertest ammonia-nitrite-ph,how large is your tank what type of filtration do you have. – trond hansen Feb 8 at 9:01
  • I updated the post. I don't have those measures but was it maybe due to water full of their poops? – Tina J Feb 8 at 14:35
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    so you have not removed the waste your fish have made for a year and have no filtration and now you are asking why your fish have gotten ill is this correct? i am sorry but i do not know what to say right now.... – trond hansen Feb 8 at 16:28
  • Yes I didn't know those waste is dangerous for them. Is that toxic? – Tina J Feb 8 at 19:56
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    please read this thegoldfishtank.com/goldfish-info/mistakes/… and this thegoldfishtank.com/category/goldfish-care and yes ammonia and nitrite are toxic but so are the rest of the waste products that have acumulated in your tank. – trond hansen Feb 9 at 6:33
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I worked at PetSmart for a little bit and what I found out (or really, what co-workers told me) is that goldfish don’t have stomachs so they can’t filter food. This causes them to poop a lot which produces ammonia and then kills them. So it’s essential that they have a filter.

It sounds like your aquarium may already have a filter. So I’m not sure what really could be “killing” it. Maybe another fish hurt him or something else could be going on!

If you keep him separated, make sure you maintain filtered water and have an appropriate temperature.

Best of luck!!

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  • It's happening now. I see her left part is always higher and when she swims she gets upside down and has no balance :( – Tina J Feb 14 at 16:08

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