I got a hard on reading this thread, bloody brilliant. At my work we have a huge grouper which is pretty much used for disposing of other aquarium inhabitants. I fed it a big tyre track eel , angel fish , cod, mackerel , mullet before. If he doesn't eat them the big eels do. Cant do it when the public is around because will get complaints we wait to closing time.
Would've never thought to see that...Haha, bye bye discus!