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Lack of oxygen mate! Id be quick and put some oxygen in the tank or bowl, If a tank, the best idea would be to get urself a air pump (about $15-$25AUD), an air flow tap/adjuster (which is a little piece of plasic about 3-4cms long), get urself some air hose 2-3mtrs and an airstone for about $1.50-$3. The cheapest thing to do which is effetive but not the best way would be to give ur tank a 75% water change and get urself a few LIVE plants from ur aquarium, it will probably cost u between $5-%20 depending. Some plants to look out for are ELODIA- its really good with oxygenating, WISTERIA and banana lillies. You could even put an OXY BLOCK in there too, That would help heaps and would probably set u back $3-$4 extra. If you have a bowl, do a %75 water change right away and add live plants and oxy block. If u have a reasonably large bowl u can put a pump in aswell if u like. Cheers champ :oD catch!

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17y ago
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11y ago

This may be due to poor water quality which includes high ammonia or nitrate levels. Do they look like they are gasping for air? this is because of ammonia. it can be fixed by going to the pet/aquarium shop and buying a product called Prime which should be used per the directions on the bottle, but in addition to this, you need to make sure you are doing regular weekly water changes of at least 50%. This is the only way to keep the toxins in the water at safe levels.

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14y ago

when the oxygen level of the aquarium is lower then fishes generally swim at the top. Ensure that the air pump and diffuser is of adequate capacity and is working for a reasonable period of time during the day. Also the temperature of pond should be around 24 - 28 deg so that the dissolved oxygen in water is maintained

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13y ago

Different species of fish like different layers to swim around in. Some like the bottom, many like the middle, and some like it near the top.

Or - the water at the top could be warmer due to the lighting. The freshwater tank should be kept around 77 to 79 degrees, normally. Is yours warm enough?

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12y ago

the fish dont have enough oxegeon i had the same problem what you do is lower the water level leave the lid slightly off for more air and replace your airstone and filter if you have a heater in there turn it down slightly

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12y ago

Because they are waiting for someone to feed them - their little fishy brains have fiqured out that the food comes from the top.

Fish also swim at the surface of tanks (and also of ponds) because there is more oxygen there for them.

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14y ago

they cant breathe and are trying to get air. get a water filter. this will put water in your tank

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13y ago

Your fish probably has swim bladder disease.

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11y ago

Bettas are the only fish that can breath our oxygen so if they didn't come up they'd die

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Q: Why do your tropical fish come to the top of tank as if they gasping for air?
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