nocking on wood, never had anything major so far, however I remember a year ore so ago that I read op on all kinds of pest in a tank, and wrote some symptoms down, gust so I have some reference in case of something, same thing with symptoms of certain additives and low and high KH and so. 
 
anyhow, 
 
I have it all in my map in my fish room, and as far as I can read back, the buggers you mention are hard to get rid off because there eggs hatch each 3 to 4 days. 
 
Salifert flatworm exit seems to help (adding it each 4 days for 2 weeks) 
 
other thing I read, is Potassium permanganate. 
 
the potassium permanganate is not a proven remedy, however by many dun with success. 
 
I read the drugstore and ore pool outfits have it, where the drugstore might be your best bet, as you only need a few m. grams  
 
it is mentioned that it will nuke all and everything so be careful with this one. 
 
do some google to read up on it, I don't have time to lock into it all again now, but this is what I wrote down. 
		
	
		
		
		
		
		
	
		
		
	
	
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