Flatworm Exit Fail

Too bad on the wrasse, but understandable. I agree they are not typically an issue, only so if the population explodes. In the wild most are actually parasitic. However, the parasitic ones are actually rare in our systems. The photosynthetic ones are only an issue when they are covering the corals. As mentioned though, most of the time the do crash on their own. I've had some from time to time, little tan ones on the glass for example (maybe similar to yours) that just go away with no rhyme or reason. The bigger red ones (Red Planaria) are the most common in our systems. These are one of the few non-parasitic ones, but seem to cause us the most issues. Melevsreef.com - Flatworms | How to eliminate them!

 

Yeah at this point I might just have a paradigm shift - maybe the FW's I have are not so bad after all. They certainly have not exploded in population and I do not have any Red Planaria - I looked at many google images of them and they do not resemble the species I am finding in the tank.

 

Maybe just dip the corals you're intending to pass along...

 

My thoughts exactly!