Flukes are the names given for parasitic trematodes or flatworms that live inside your fish’s gills or skin. They are nasty because they feed on the tissue cells and mucus, anchoring down on your fish with their hooked mouths. The flukes have a basic life cycle, reproducing eggs and hatching them into adult larvae. 

As warm temperatures accelerate their reproductive process, it is important to monitor your aquarium’s water parameters.