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What’s wrong with my Calvus

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I have noticed my black calvus is sitting on the bottom and breathing hard.  The rest of the fish look fine and the water parameters tested out all OK.    I have noticed the edges of his gills look white.  I have attached a photo below.....what can this be (gill flukes?).1276B7B3-4B9E-4D1B-9D6B-BE697BABAF14.jpeg.5ddb426df1fbd12929702345929e1a95.jpeg

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Double checking nitrite confirmed at 0ppm? Check temperature isnt too cool. Flat fish are very easy to inspect with a microscope while alive to confirm flukes. Without doing that its all guess work.

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Ammonia and nitrite were both confirmed at 0.  Nitrate on the other hand seemed high, although it is really hard to distinguish between 40ppm and 80ppm on the test kits.  I ended up doing a 50% water change, and he is looking a LOT better.  I will keep an eye on nitrate over the next few days and see how it goes.  Temperature is within the correct range.

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Would not expect high nitrates to cause those symptoms, but water changes are never a bad idea IMHO.....  well unless the problem is low temperature!

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