Hi! I've had a pair of Celebes Halfbeaks for a little over 2 weeks now. When I first put them into the tank, they were completely healthy, past some torn fins. Now though both of them have inflammation around the anus and the whole area is generally red. They defecate in thin, white tubes. I believe that they have internal parasites from the dealer. I need to know if there are any anti-parasitic foods you could recommend? And where I could find these foods? I don't want to do a water treatment, as I'd rather have it in the fish. Thanks!