Here is my advice.
If you are a fuge, pod, critter type of reefer. Don't use flatworm exit!
If you are bb, rock cookin, can't skimm enough type. Go for it. it will work great. Have enough ro for 100% water change- mixed, heated, and ready to go if needed. Employ carbon in large amounts. Have extra FE around in case they come back, so you can nuke em again.
To tell you the truth they really don't harm anything unless they crash. Sucking them out regular can be viewed as export of nutrients. With some folks they just fade away (if nutrients are low enough). Some people have luck with low salinity, ie making them crash with a swing, or just having it low will slow down thier breeding.
Good luck & Happy Reefing!
Ant