+1 on flatworm exit. 
 
I have dippped all my new corals in my 190g and still ended up with them somehow. 
 
 Just dose it like the intrsuctions say and in a few mins you can watch them start moving all fast and then DIE!!!! make sure you run lotts of carbon after as the flatworm exit is non-toxic but when the flatworms die they release their toxins into the water and is no good for the tank. also have a good amount of fresh saltwater and do a big water change after the carbon has run for awhile. 
also try to siphon/net out as many as you can before/during the flatworm dose. 
 
And as lornzo said, wait a few days/1 week and dose again to get any that are deep into the liverock. 
		
	
		
		
		
		
		
	
		
		
	
	
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