I've heard they don't eat trigger pods
because of their size, but need copepod. I've had one over a month and a half. I only have a 38G, but it has a 10G sump, and was up well over a year before I bought him. I knew for sure there was a good pod population, as well as lots of live rock with lots of nooks and crannies for them to hide in. That said I'm still nervous, but I watch him continously munching throughout the tank. If you don't see pods
hiding in your rock, I think you're in trouble and would be best to return the fish for both of your sake. We're not trying to be too critical, it is just based on people's experience with this creatures.