Have you done a water quality test?
How big is the tank?
Do you have filtration?
hi thanks for helping me
yes i have too filtrations
i moved my fish from a 16" to a 32" but i had to put it in a cooking bowl because the other to fish keep biting it so it speek,
i have never done a water wuality test i clean my filters one a week and the tank every 2 week but the bowl its in now everyday
The fisrt step is to check your Ammonia, Nitrites and Nitrate levels in the tank. What you are describing is due to Ammonia spikes that cause an ammonia burn. This has caused the blackening of the skin as well as the shredded fins. Some fish are more sensitive to the Ammonia spikes in a tan.
Keeping the fish separate in a hospital tank will be the way to try and save it. The fish has to be free of the ammonia levels in the water. When you do a water test the Ammonia should be 0, the Nitrites 0, and the Nitrates less than 20ppm.
You can use Amquel in the water to remove the Ammonia and Chlorine in the water. Next you can use Stress Coat to help with the healing of the fish. This is some information on Ammonia Burns: http://www.happy-goldfish.com/blog/a-closer-look-at-black-spot-disease-ammonia/
I would do a partial water 3/4 change in the tank and continue to do that until you can get the water parmeters down to where they need to be. The Fish should heal if you can get rid of the Ammonia. Right now you may have some problems even keeping the fish is a cooking bowl since there is no filtration. Joan
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