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Help - Fish with permanently opened gapping mouth?


Haizel

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ph is 6.8-7.0, 27.4 temp, has been like that for a year, never seen anything like it before, tetra has been like it for about 6 weeks now, still manages to feed but looks like something out of a horror movie. All the other 20 fish in the tank are thriving, including about 10 other tetra's.

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I sounds like there is not enough oxegen in the water , can you try adding an airstone to the tank and turning it up high, Is the surface of the water disturbed with your current filter ?, this also would help.

good luck

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