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I had two gold fishes and a few days ago I noticed my other fish was sitting at the bottom of his tank and struggling to to get to the top (swimming to the top and automatically sinking down). I had no idea what was wrong because he wasn’t acting that way the day before, so I panicked and did a full water change thinking it might improve and after my fish being in the water for a few hours he was still sitting on the bottom until he died.

My other fish now has a wound on the top of his head and I’m not sure what it’s from; all help is appreciated.

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    please post the last readings of your watertest PH-AMMONIA-NITRITE,how big is your tank is it heated and filtrated,for how long has your tank been running and is it properly cycled. Nov 16 '20 at 5:03
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Update: The wound is almost gone and healing well. What size tank is recommended for 1 fancy goldfish and a large sucker fish and a baby sucker fish. Should it be heated or not. When should i do water changes?

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