Tina,
Sorry to hear about your fish. It may very well be that it was collected and/or handled improperly and was doomed before you received it. I think that is the case with many fish that die in the first 30-60 days.
It sounds like it is too late, but you could try live brine and live blackworms. Also, there is a supplement from Brightwell called AngelElixir that might stimulate a feeding response if food is soaked in it.
Good luck.