yes if he doesnt eat he will die. Have you tried live brine? live algae? if you can get him to eat anything, it is usually a good start. Lots of fish seem to learn by example from other fish eating in the aquarium. I have decided to quit buying pacific blue tangs. It is my understanding that they are being over harvested and the mortality is very very high. I am not saying anyone else should this is just for me. I see them come into the fish store and they are bought by new hobbiests the day they come in. Most are back saying they died very very soon. Its not the fish stores fault, it doesnt seem to be the persons fault. Its a combination of collection, shipping, holding, transport, and stress in the home aquarium. I am sorry about my rant. LOL I just havent seen them be a hardy fish to begin with, and the quality of stock we are getting now seems even more stressed than just a couple of years ago. Steve