Sorry, but no fish is compatible with an Octo. It will see them as food, so bye bye fishy. It could possibly even get hurt going after a Lionfish, so I wouldn't try that one.
I have a long spined urchin in with my octo and they do fine together. Star-fish are also compatible with an octo, but I wouldn't try a chocolate chip star. I've had 2 of them in my FO tank with no problem, but I've heard horror stories of them attacking fish. I don't think they would hurt an octo, but they could stress it out.
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