white and red flatworms

[comycus]

Would like to find out more about the difference between the 2 flatworms. I have ~3-4 white flatworms that can be found on my glass surface.

Based on my research, the white ones are quite harmless and doesn't breed to dangerous levels that will harm corals. They are a known predator of copepods, and are rumoured to keep the red flatworms in check. The red ones are the ones that breed to catastrophic levels and is a common reef pest.

Are these information correct? Should I know anything else about these white flatworms before I consider whether to exterminate them with Salifert Flatworm exit? My tank only has 1 toadstool and 3 chromis now, can easily move them to my QT tank if I need to dose flatworm exit. Or maybe these are just harmless food for my future wrasse/dragonet?

[comycus]

hmmm anyone with experience in these white flatworms can help?