Wow, that sucks.  I can only imagine your stress level.  Not being able to get a fish/eel to eat is the worst feeling!  I would guess he is going after at least some pods or something in the tank.  I would try some garlic if you haven't, soak the food in it or drop a few drops in the tank a minute or two before you feed. 
 
Good luck! 
		
	
		
		
		
		
		
	
		
		
	
	
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