I asked this same question a while back because I really wanted to put a red wolf with my bichir. The general consensus was yes, it can be done as long as they are similarly sized. The red wolf isn't quite as aggressive as the mala. wolf, so it is easier to put with other fish.
In regards to feeding, my mala. goes through phases. When I first got him he would eat anything, though I usually feed him raw tilapia and shrimp. Then he stopped eating, so I put some live food in. He LOVES live food. I was worried that he would start only eating live, but he seems to do fine. Now I generally feed him a live fish (convict or mollie) once every week or two, and it keeps him eating whatever I put in the tank. Long story short, they seem to like a varied diet.
Hope this i helpful!
-John