Saw the dwarf gourami yesterday with about a 1.25" white poop hanging out. Swimming and eating fine. Has had some stress lately as I did a large water change 3 days ago and also removed all artificial decor and replaced with natural/live decor, so big change for him. Looked at ordering Flubendazole, but upon reading it seems it harms fish without scales. He lives with a pictus. Do I just remove and treat the gourami in qt? Shouldn't I be treating the whole tank?