Symptoms:

• Flat somewhat round parasites can be seen crawling on the fish

What is it?

Fish louse are not actually lice, but parasitic crustaceans.

How did it get there?

Could have been passed to your fish by a new addition to the tank.

Treatment

Medications that treat against parasites such as Ick or velvet will not work against these little crustaceans. Paragon, Trifon, or Anti-Fluke treatments will work, use as directed.

Prevention

• Quarantine all new fish for 2-3 weeks before adding to a new tank.