Parasitic Isopods
Details
Scientific Name: Cymothoidae
Identification: resembling the terrestrial "roly-polys" or pillbugs, parasitic isopods attach themselves to a fish's body; some species will eat and then replace the fish's tongue
Pest Management
Treatment: remove isopods from fish using pliers; you can also trap the unattached pests in the tank by using a container baited with food
Prevention: Carefully examine, clean, and then quarantine all rock, coral, macroalgae, and fish before placing in the tank.