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Especially if he is hanging at the surface, it means that he isn't getting enough oxygen. The most likely reason for this is too much ammonia in the water - ammonia damages the gills. Do an immediate 100% water change, treating the new water and ensuring it is the right temperature. If this does not fix the problem, look carefully for any other symptoms as something could be wrong. Note that long term exposure (over several weeks) to high ammonia levels - such as a betta would experience if kept in a container of less than a gallon without daily water changes - can cause permanent gill damage.

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17y ago

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