What can I do to get my mimic filefish to eat?

I got a mimic filefish yesterday, and it wont eat. I've tried very small peices of scallop, squid, and mysis shrimp. I put in a peice of nori on he rock and in my veggie clip, and he wont eat that either. He has eaten all of the algae off the gl, and picks at the algae on the liverock though. What can I do to get him to eat? I was thinking about trying to feed him fresh veggies, but I only have spinach, kale and cuber. Can he eat any of those? Thanks!