I discoverd a similar animal as well..  two actualy, one a white worm 1/4" in length and a smaller red one about 1/16"  so tiny you could easily miss it.  Again it was attracted to my small flash light I was using to feed my Sun Coral. 
 
Was really weird..  As soon as I moved the light far enough away they would float to the bottom and just do normal stuff then if I bring the light back.. boom! crazy swimming at the light..  They would follow it everywhere..  
 
Anyways..  I don't see any harm in it so far.. so..  let em be I think. 
		
	
		
		
		
		
			
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				Chad
  
			 
		
		
		
		
	
		
		
	
	
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