I just found something in my tank at night. There were two of them; I managed to catch one, but the other escaped. Is this a flatworm? What should I do? Can Salifert Flatworm Exit kill them, or is there another product I should use? I've heard flatworms are not reef-safe and I'm not sure if there are more of them. Together, they were about the size of a Loonie dollar, which is quite large. Also, I think it may splitted into 2 when I catch it.
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