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Lack of oxygen in the water. The fish is gasping for breath. Besides, no freshwater should be kept in a bowl with no filtration (except for a betta) Bettas need good clean water too. The purpose of filtration in aquaria is to use bacteria to convert the dangerous byproducts of aquatic life in water. Those deadly poisons are ammonia and nitrite. They are converted aerobically into relatively harmless nitrate.

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16y ago

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How does a Siamese fighter fish normally act?

If there are bubbles around the top of the bowl, it means your fish is happy :)


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It needs oxygen.


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