FIN AND TAIL ROT
Fin and Tail Rot is caused by several types of gram-negative bacteria and often occurs simultaneously with other diseases. Fin and Tail Rot can be difficult to cure, especially in the more advanced stages. If left untreated, it will eventually kill the diseased fish and infect all other fish in the aquarium.
Fin edges turn black / brown
Base of fins inflamed
Entire fin may rot away or fall off in large chunks
Fins have white dots
Use anti Tail and fin rot medicines according to the tank size (Dosage 10 ml per 100 liters)
Use anti fin rot and tail rot medicine. Change the water and check the filter. Treat with a suitable treatment such as phenoxyethanol, malachite green methylene blue or other proprietary agent (most seem to prefer aquarium salt; however, it is important to make sure the product is for freshwater, not saltwater, fish). Find out the pH and correct it if necessary. Use antibiotics if the rotting is jagged.