I'm not certain about all species of puffer but lionfish and eels will not eat coral. I've got a snowflake moray and a fu manchu lionfish in my reef tank. I also kept a volitan lionfish for about 5 years in a reef.
Without coral I think 10x your tanks volume per hour would be a good start although you certainly could have more. Depending on the type of lion I don't see a problem with 30x.
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