Yes they are tough to keep , I only tried once could not get them eating . Maybe Myka  can chime in (have not seen her for a while) but last I seen she was keeping one not sure if she was successful or not .  
I have had luck with getting my blue spot boxfish to eat (very tough to get eating) using LRS reef frenzy food so maybe worth a try if you have a lfs that carry's it , they also sell fish eggs witch are meant for finicky eaters . Also maybe try adding some copepods maybe might entice him to start eating , PE calanus might work also . Good luck 
		
	
		
		
		
		
			
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