Strange disease

[BassetsForBrown]

Hi,
A fish in my father's freshwater 55g aquarium has 4 or 5 large white bumps on its tail fin. Been there for about 5 days, don't seem to be affecting any of his habits at all, 5 other fresh water fish in tank are unaffected seemingly. All parameters r perfect. Cant take a photo for about an HR, but will do than.

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[BassetsForBrown]

OK, sorry for the delay, finally got the pictures.





I know the pics are kind of bad, but I only have my phone to take them with. The disease/issue seems to only be affecting the tail fin and pelvic fins. Also like I said, there is no noticeable change in his behavior/eating habits.

Any help would be greatly appreciated, thanks again.

 

[zoohouse]

Looks like fin rot. You need to qt and treat asap. Water conditions or stress is what is causing it.