Fin rot is caused by bacteria
Do a 100% water change. Once you have washed the tank thoroughly and let it air dry, you can place the gravel and the tank accessories back into the tank. If your tank is uncycled, do a 100% water change using dechlorinated or conditioned water. Make sure the water is at 80-82 degrees F (26-27 degrees C).
Check the pH of the tank water. Before you put your fish back in the tank, you should use a pH test kit to ensure the water quality is good. The pH should be around 7-8 and the ammonia, zero nitrites and nitrates should be no higher than 40 ppm.
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Murph has some fin rot due to bacteria being introduced into his tank,
Follow the above directions to clean and disinfect the tank and he should recover completely
some bacteria is good but bad bacteria is harming Murph.
Add Bettafix to the tank as will as a through cleaning
yes, you can put him back in his tank the same day after you have cleaned it done the water change and added bettafix
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