It's tough to kill a Trigger. My Blue Trigger was so shy I didn't see him at all for the first week. I didn't feed him at all (he was the first fish in the tank so that was no problem). Once he started to come out I started putting brine shrimp in the tank. Even though he was the only inhabitant he still would just peek out, grab a bite, and hide. After about 9-10 days he came out and swam regularly and I started feeding him and he eats like a pig now.