fish has white stringy waste, what to treat with

[romsoccer12]

well one of my fish has white string waste, and there is no way i can catch him to put him in QT.
is there any antidote i can put in the main tank without it harming anything?
is there any food he can eat to help?
any other info will be great

 

[Gwynhidwy]

Some people have treated their DT's with Prazipro with no apparent ill effects. Or you could try the medicated pellets with metronidazole in them.