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yeah, that’s very true. I have seen Ctenochaetus tangs to just swim in “patches” which is why I assume the smaller ones are told to be suitable for 4’ tanks (I.e. twin spot, square tail, white tail, yellow eye kole). I certainly do think that Acanthurus tangs thrive better in 8’ tanks and truly do often need that space, I mean a naso needs 8’ but not because it’s a hyperactive swimmer (IME these fish are actually the calmest swimmers of all the tangs) but mainly due to its VERY large size - I think the smallest of that genus can get 18” and the largest of that genus is sat at 2’ long (24”). The Zebrasoma tangs I can’t speak on about their wild swimming pattern since I have never seen a wild one. Paracanthurus… 8’ tank at the bare minimum as 6”-7” adults for certain, just look at one in captivity and you’ll understand. Prionurus, now this genus I don’t think is kept in captivity or if it is then they’re in the largest of tanks, they’re very similar to the Acanthurus in swim patterns.I know - I posted the research several days ago. You are absolutely correct Acanthurus tangs can and do seem a far length daily. The point being - some do not - and if they do - its not 'for fun' -or 'to relieve stress' - its to get food.