huh, ive had a few anenos that i just couldnt get a clownfish to host but they were great residents in the tank. not to much movement and greedy eaters. I suppose you know the name of the anenome? Condi, flower, fire? Those are not reef safe to an extent and will eat slow moving or sleeping fish. If you do feed your anenome well, usually it leaves others alone...IME.
Remember, anenome belongs to the class of "cousins of the jellyfish" and use micro harpoons with venom to subdue their prey. Not really electricity like an Eel or something else.
Sorry about your loss though, good luck and better reefing!