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Fritz Expel-P is effective against Nematodes, Roundworms, Nodular Worms, and Hookworms. Symptoms can include worms visibly protruding from the anus of the fish, wasting, abdominal bloating, disinterest in food, or rapid breathing or gasping, Can also be used as a coral dip to treat for flatworms and pest nudibranchs.
Expel-P does not treat Cestodes (tapeworms) or Trematodes (flukes). For these parasites, try Fritz ParaCleanse.