I use aiptasia X but it's expensive and they keep coming back.  Your tric is good but must be pretty hard to do on the tiny buggers that hide within zoanthids colonies.  I hate those with a vengance.  They anoy my zoanthids and yet they are so small that they are very hard to kill as they retract too fast.  It is also tricky to put aiptasia X or any other stuff in a zoanthid colony, so it is a real bummer.  I am thinking of getting a few berghia. 
		
	
		
		
		
		
			
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More fish die from human stupidity than any other disease...
			 
		
		
		
		
	
		
		
	
	
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