I had a moray zebra eel for years. I have been able to put any kind of fish with him and he has not even attempted to eat them. I know that the zebra is one of the best eels for a fish only tank. Mine was so gentle that you could pet him.
The only problem you could have is how big they can get. Mine was between 3.5 to 4 feet long before he died. I would suggest as least 180 gal tank. When I bought him he was about two feet. I had to make sure that his cave (they like to stay hidden) was big enough for him. In fact i found him one day stuck inbetween some rocks and the glass. I got him out however part of his body started to swell and he died about a week later.
My eel was very active though. Once he got use to his home he would swim all the time. Even when the light were on.
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