My molly fish's tail is turning clear. Is it fin rot? How do I fix it?

Question

My molly fish’s tail is starting to turn from black to transparent...is there anything wrong with it

Dr. Massimo Orioles, DVM, Cert AVP, MRCVS · Accepted Answer

Although a picture of it would be essential to determine the underlying cause, this could be caused by fin rot. Fin rot is commonly caused by poor water quality. If he/she is in a tank larger than 2 gallons move him/her to a smaller tank if possible to make treatment easier. The best treatments for mild fin rot are frequent water changes and aquarium salt. Maintain the water the treatment tank between 76-78'F. Turn the light and filter off for the time being. Aquarium salt can be used at 1 teaspoon per gallon. Dissolve it in tank water before adding it. Perform daily 100% water changes, making a fresh salt solution each day. Treat for a maximum of 10 days.

My molly fish's tail is turning clear. Is it fin rot? How do I fix it?

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