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Unless you have a specifically top dwelling fish such as a Hatchetfish, then there's either an oxygen problem or an ammonia problem in the tank, or a combination of both, with needs some serious seeing to asap before the fish die - a large partial water change and a check on whether the fish you have in the tank are suitable for that size tank and that size filter.

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13y ago
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12y ago

It may be constipated, or sick or dying. It could have gulped up air during feeding, it could have a parasite, it could be trying to get oxygen.

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15y ago

When fish die, their buoyancy bladders stop functioning, this is what enables them to float normally when they swim (belly down). When it stops working, the fish will float belly up.

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15y ago

they might have a swim bladder disorder

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14y ago

It means it's dead.

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15y ago

its dieing

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Q: Why does your fish float at the top but is still alive?
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