My local LFS has some ghost knife's in stock so I asked some questions about them.  It turns out they grow to 1-1.5 feet long so they need a lot of room.  The LFS was saying that they once took a ghost knife for credit that was kept in too small of a tank and it's spine was crooked from the cramping. 
		
	
		
		
		
		
		
	
		
		
	
	
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