I've had this fish for over a year, in a tank in which nothing has been added for 6 months, and I noticed this poop coming out of her the other day. I would have no idea how this fish would get any internal parasites, as I haven't added anything, not even a plant in at least 6 months in a very established aquarium of 3 years. This fish eats a lot of dying plant leaves, snails, and algae, so I'm thinking can any of those things make fishes poop appear this color? Does having white, not stringy, but just white poop always mean internal parasites? As you can see, she's not lethargic/skinny, she is a very good size, especially for her age. There is absolutely no signs of discomfort, no flashing, itching, shaking, no physical behavior to sign that she's sick. I've attached a picture of the poop, and the fish for some further insight, thanks in advance!