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Are my ammonia levels too high if my ottos have recently developed some red gills and part of its underbelly? I recently introduced one into my tank and after a day, this red spot developed. My other ones have it too.
 

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Yea, 1 or 2 otos i bought from a LFS had red underbelly. I don't notice anything different from them though, and they seem to be eating and playing like normal for 1+ month I've had them. I'm not 100% certain but I think the red belly are becoming less noticeable now and the underbelly is becoming white like other otos.
 

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Mine have pink gills, no pink stomach though. I don't test for ammonia levels, but I'd bet that they are zero. Fish gills are supposed to be red, there purpose after all is to oxygenate the fish's blood, which would result in a red color--so I think it's normal.
 

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Are you using high tech co2? Any other fish with red gills or spending most of their time at the surface? Could need some oxygen near the bottom.
 
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