<a href=showthread.php?s=&postid=10072270#post10072270 target=_blank>Originally posted</a> by melev
In the future, you might prevent adding flatworms to your tank by treating any new additions with Flatworm eXit. When you get your new coral, float the bag. 10 minutes later, open the bag and drop in 3 drops of F.E. and let it soak. 8 minutes later, add some tank water. And again 8 minute after that. And 8 minutes after that. Around that time, the floating bag may have quite a bit of water in it and you should have seen if any flatworms were in there.
Using a turkey baster, blast off the coral to see if any fly off. You can rinse the coral, shaking in strongly in another bucket of tank water, then place it in the system.
Of course, there are other dips that people utilize to deal with red bugs, AEFW, predator nudibranch, sea spiders and more. But just to avoid flatworms, the above work.
Years ago, they were a real plague and many LFS had them in their display tanks. Many hobbyists did what they could to stop the sharing of these beasts and now you only hear about them occasionally.
Siphoning them out and using fish to reduce their population is okay, but I'm guessing at some point you'll need to treat the tank. I've done it several times and never lost any livestock. Others have been less lucky because they underestimated how many were in the rockwork. When you are ready to treat, be sure to let me know and I'll give you the rundown to avoid issues.