If you have planaria in your tank, you will know what a pain they are living in your aquarium. If you’re not sure what they look like, theyre white flattish worms that tend to be about 10mm long and eat pretty much everything (apart from plants). Planaria scavenge food and as a result, are impossible to get rid of. They will also compete with shrimp, and if allowed will attack them or their eggs. If you feed your shrimp food, planaria will get there first which is what makes them so hard to get rid of. In the past, it has always been difficult treating a shrimp tank with anything, particularly a wormer which gets rid of Planaria. Shrimp are very sensitive and as a result, can easily be affected. Genchem No Planaria eradicates planaria without affecting shrimp.