Planaria (platyhelminthes), also known as turbellaria or flatworms, are unwanted visitors in an aquarium. Some of them can pose a threat to fish. Due to their nocturnal lifestyle, the presence of these parasites often goes unnoticed. These animals have the ability to multiply in large numbers.

In freshwater aquariums, their victims include small shrimp and their offspring, as well as weak animals, young fish, and eggs. Flatworms can also live in marine aquariums; however, a large number of them can cause damage to corals and other animals.

Planaria X reliably removes these parasites from the aquarium without the use of chemical additives. The planaria crawl into the trap through one of the 8 openings and cannot escape again due to the special design. It includes two special baits for immediate use.