Red flat worms

[N.C Mike]

Hello fellow reefers, I received some coral from a friend and along came red flat worms. And they have multiplied fast, what the the best way to get a handle on these things. I've heard certain fish can do the trick,also chemicals but I've heard they are not to safe. Tank size is 180 with a 60 gallon sump lots of soft corals an bubble tips. What have you guys had luck with,thanks for any advice.