saliferts flatworm exit will kill them but not the eggs . It takes a few treatments spaced out to end thier cycle(adults, eggs , newly hatched). Its better to just get a wrasse that eats them if you are going to keep zoos. Even if you dipped the new zoos you still would have gotten the nudis cause it doesnt kill the eggs. Dip with quarrantine would have.my green coris eats the nudis and thier eggs. I have had a 6 line and all I ever seen it eat was fish food(lazy fish). If you use the salifert flatworm exit in your tank which you should or you could miss a few , you better have a 100% water change ready. If you have any flatworms they will all die at once poisoning everything in your tank. If you see 2 or three you probably have hundreds in the rocks so beware.