I just tried this yesterday - added 2 small false perc. to a 190g that has a large gold stripe maroon clown.  There are also 3 anemones in this tank and the GSM always hung out in the 2 RBTA's that are located at one end of the tank.  A large sebae anemone is at the other end of the tank and that is where I added the 2 small percs to.  The GSM made a b-line to them and immediately started to beat the hell out of them making visible bite marks on them.  I waited for maybe an hour and decided the 2 little guys were just going to be killed so I removed them and put them into a 10g nano for now until I decide what to do with them.  FWIW the only other fish in this 190 are a large blonde naso tang and a mandarin so definately not a full tank by any means. 
		
	
		
		
		
		
		
	
		
		
	
	
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