flatworms

So I am in the middle of a battle with Red Planaria which has been going on for several months now. I've tried manual removal (keeps the population down, but it comes back), Flatworm eXit (corals do not like this), 12 Line Wrasse, and a Blue Velvet Nudibranch. Some of these have shown promise...

Things are getting out of control with Red Planaria in my 29 gallon reef tank. I've tried it all...manual removal which seems to be a daily chore, Flatworm eXit (multiple occasions), 12 line wrasse (casually grazes on them), but whatever I try I still find patches of flatworms on my rock work...