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Very often this type of behavior means that there is not enough Oxygen is the water for their Gills to process. Yhey come to the top and GULP air.

You should have a bubbler introducing Oxygen into the water to help solve this problem. Real Plants in the tank also help to Oxygenate the water.

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10y ago
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Q: Why is my Oscar staying at the top of tank and facing backwards and opens mouth a lot to breath.?
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