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					Originally Posted by Delphinus  On the advice of Seahorse_Fanatic I picked up a yellow canary wrasse (Halichoeres chrysus ) when I noticed flatworms in my tank around Christmas time. Within a month there wasn't a flatworm to be found in the tank.
 
And, it's a very pretty fish.    
Also called a yellow coris wrasse but it's not related to the Coris family of wrasses (which get huge). | 
	
 Picked one up today 

 He's very different looking, I like the way they move. He decided it was bedtime and went sand diving. 
 
Update March 28 08: I had a bit of a cyano outbreak, gone now, but I think the yellow wrasse has worked his magic - I can't find ANY!