Does my Lionfish ever eat?

[alfredshouse]

I bought a Volitan Lionfish from Big Als a few weeks ago. The girl there said it had been there for five weeks and was eating frozen foods. Ive put in Everything under the sun and it doesnt seem to eat very often, maybe once a week it eats a silverside. Does anyone else have this problem? I should mention that he appears to be healthy, he swims, he perches. Ive tried soaking food in garlic, letting it float, putting it on a skewer and even pestering him , by hanging it in his face. Any thoughts??