I am not sure if my fish have a parasite or not, but it seems like sometimes they have stringy white poo and other times they dont. Sometimes they start of stringy and white and then gets thicker and brown as more poo comes out. Any recommendations of medications i can soak the pellets in to get rid of any possible parasites? These fish are expensive and very dear to me! Or any good medicated food i can feed them that they will actually eat? Please let me know as i want to go out today and get it!