The flat worm eating fish option is a bit of a fantasy. Had a yellow damsel for flatworm that definitely ate them, but you have to starve the rest of the tank.
Who wants mushy brussel sprouts when they can have steak instead?
The nudibranch, blue velvet slug, did a good job while it lived. Must have had a couple it didn't find because they are slowly coming back.
Have not taking the time to stockpile water for the 75 and break down and use flatworm exit yet.
That will probably be the next likely scenario.
Fish don't bring me in the flatworms they only bring in velvet and ich.
Flatworms come from other people's live rock or from coral frags.
Make sure you get all of your Coral frags when you buy them to avoid this in the future.
Two of my favorite LFS have issues with flatworms.
It's just something that's very difficult to eradicate once you get them.