many have kept frogspawn and hammer in close proximity with success, but this isnt much surprise is it?  torch and another of the previous two euphyllia (like frogspawn) would be a much different situation just because the torch is known to generally be far more aggressive than the others. 
 
if you insist on it, i would give the torch plenty of space around it, at least until you can see how far its sweepers can extend. 
		
	
		
		
		
		
		
	
		
		
	
	
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