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Why is my fish discoloring and turning black?

Why is my fish discoloring and turning black?

Updated On August 9th, 2018

Pet's info: Fish | Unknown - Fish

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Answered By Andrea M. Brodie, DVM

Veterinarian

This question includes photos that may contain sensitive content. Click to view.

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That is not a good sign. This basically means that your fish is not feeling well. The reason for this is usually either water quality or a temperature problem. You will need to have your water quality checked or check it yourself, and make sure that the thermometer is working and the water temperature is appropriate for the type of fish you have. Check water chemistry using a home test kit or by submitting a water sample for testing. Aim for 0 ppm ammonia and nitrites with a 40ppm or less nitrate level. Perform partial water changes to stabilize chemistry and maintain water quality. Use only aged or conditioned water that is temperature matched to prevent stress or shock. Observe your fish for spots, wounds, blood spots or similar signs and if that happens ask us again, preferably with a good photo of your fish.

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