if you wanted to try a live food like searescue suggests ghost shrimp and mollies are a better choice.  that said, in an emergency and just to get him back on food most people would agree that a goldfish or two isnt going to be problemtaic in the long run.   
 
do you think there is a possibility he was overfed?  ive read that if they gorge themselves they can have trouble passing large quantities of food and it can plug them up.  if thats the case i dont know what much you can do about it. 
		
	
		
		
		
		
		
	
		
		
	
	
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