my sister called me and said my catfish has a infection its a feather fin catfish.

sorry for the pic she don't have a good camera.
anyone can tell what that is i had a similar thing happen to my ornate and i made a thread there
http://www.monsterfishkeepers.com/forums/showthread.php?t=365006
if it spreading how can i go about stopping it. The last time i checked my water which was last week(sunday) was ammonia was at .5 i think and i told my sister to cut back feeding and do a another water change int he middle of the week. everything else is fine

sorry for the pic she don't have a good camera.
anyone can tell what that is i had a similar thing happen to my ornate and i made a thread there
http://www.monsterfishkeepers.com/forums/showthread.php?t=365006
if it spreading how can i go about stopping it. The last time i checked my water which was last week(sunday) was ammonia was at .5 i think and i told my sister to cut back feeding and do a another water change int he middle of the week. everything else is fine