Depending on how big he is try guppies or feeder commits. Also feed him right after you shut the light on the tank out, that's what I do with my Delhizi and he is eating like a pig!
Did you really just reccomend feeders? I'm not even going to get into the nutritional, disease introduction, ethical part of the debate against feeders...but simply, why? All they do is make your senegal, one of the tamest of the bichirs agressive...not to mention you will probably kill your senegal with some disease intoduced due to poor quartining and whatever else a feeder brings with it...