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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.
The small white flatworms found in aquariums are planaria. Fish  that eat these small worms include angel fish, Betta fish, mollies,  guppies, common blowfish, and goldfish.â¦. 1 person found this useful.lanarian is a regenerating non-parasitic flatworm. Most planarian  are striped or lined and some of the large type has bright colors. 1 person found this useful. Edit. Share to: 1  The Five Major Parts of the Brain At its most basic, the brain controls the body.