I've kept 4 spiny eels of different types and have always had success with earthworms. First eel wouldn't touch anything for over a week. Tried bloodworms, shrimp, krill and even fresh tilapia. Finally, went to a near by fishing store and bought some leaf worms. I cut them up into bite size pieces and as soon as my eel could smell them in the water came out of hiding for the first time since added to tank and ate for the first time since added. I've fed them to every eel since when I introduce them to my tank and they always eat them on the first try.
Another tip. If you have greedy eaters like I do, that won't let food make it to the bottom. Try a extended tongs and eventually you can train them to hand feed.
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