If you are interested, some people aren't, the whole "train your warty", train your lion" thing, does have it's draw backs. Ambush predators become more sedentary than their normal couch potatoe behavior, and basically turn into ornaments after a while being on a frozen only diet. The anglers even stop using their lure all together, maybe not even moving at all from their feeding spot. They also tend to lose interest in eating all together after just a few months. These guys do need stimulation, if you know anything about predators kept in captivity, ocean or land predators, you'll understand how enrichment in their captive environment is very important..
I've kept a few anglers, have a friend that have kept more than I, and have tracked over a dozen that came into a couple lfs over 5 years. None that was fed a dead only diet ever lived more several months. To feed a combo diet would optimum, but it rarely if ever works, if you get them to take dead, once you give them live again, it becomes increasingly harder to get them take dead again. In my opinion, these guys should be fed a live diet, or left in the ocean. How would you like to be kept in a glass cage and fed with a stick, try to give them at least a stimulating captive environment.
Mollies and guppies are good alternating food source, breeding your own mollies is an option and easy. Gut loaded ghosties are a staple for my predators, and I keep a small tank with a good stock. Set up a small tank or even just a simple container of sorts with a sponge filter and get a bunch at a time. In a pinch a peppermint shrimp, expensive but beats dying, I've gotten lfs to give me deals. Last resort even a rosie.