[I don't know Panacea, while I have never kept one, I know others have long term. Also, sps where thought impossible to keep long term 10 yrs. ago. So, I don't think you're wasting anyones time by asking a legitimate and thoughtful question about a fish you'd like to keep. I do beleive the tang would need a large tank. I love naso tangs, it's by far my favorite fish, but I wouldn't dream of putting one in anything smaller than a 250 gallon tank. I'm planning on building a 300 in the not to distant future, after a kitchen remodel, or atleast that's what my wife is telling me. So, maybe then I'll get one.]