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Most flatworms, including Procotyla fluviatilis, are predators. They eat protists (including Amoeba, Paramecium, and Euglena), rotifers, nematodes, small crustaceans, aquatic worms, and other soft-bodied animals. They also feed on dead animal matter and larger animals that are injured.
No, they cannot eat slugs. Betta fish are 1-3 inches long and could not possibly eat a slug. Betta fish eat their prey whole, and their diet usually consists of blood worms, tâ¦iny insects, tiny insect larvae and other freshwater small invertebrates. And by small here, I mean a few millimeters or less, they could not eat something that is their size or larger such as a slug. 7 people found this useful.