Flatworms are a confusing group to research, mainly because there is not much information on the types and taxonomy and we have a habit of referring to the same worm with fifty different names. There are probably a few mistakes in this article, but I tried my best!
Removal should be looked at...
Here is a list of some common worms found in a home aquarium. Flatworms, eg AEFW, and worms found on fish, eg flukes, are not included.
1/5 Harm=Minimally harmful, may be visually annnoying
1/5 Use= Minimally useful, filter feeders may help filtration (minimal)
5/5 Harm=Extemely harmful, may...