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Okay, I just did a 20% water change in Grim's tank, it kicked up what looked like little white worms. They are about a quarter of an inch long and very slender. I thought it was just debree or fish poo at first, but the wriggle and are very clearly alive. What are these? There are a lot of them. Are they dangerous? Grim is eating them, so i'm very worried, even more worried because i think he is constipated and shouldn't be getting any food at all. Are these parasites that will harm him??