u can't. even prawns will avoid them. they're flatworms or planarians. don't cause any harm to your fishes but it's suggested u remove any if u see them. some people don't mind them, some do. if u do mind them just remove them and dispose of them with your salt method. by the way, don't use a knife on them. when u cut a single flatworm in half u'll get two live flatworms. they happen to split like that. [:0]
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