Ok, so I've noticed for a while that one of my Goldfish have stringy, white poos along with regular movements. I'm feeding them NFL Thera+ so they are getting good quality food that has the garlic additive. Behavior seems the same...Fish hasn't been acting out of the normal. My question is, if it is a parasite, what can I do to aid them??? Seems like most of the meds I've researched are no longer sold and I cannot find medicated food at all.