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That’s what I say, however IMO depth doesn’t matter unless it’s a truly deep water fish like many tilefish, wrasse, peppermint angelfish. Then you need a relatively deep tank (I’d say 1.5’ tall would be a nice size for being able to have the end in your tank but also to have enough room for your top water column, middle water column and rocky areas).PS - everyone always talks about the 'length' of the tank. Yellow tangs, for example live in 6-150 feet or so deep. Do many people have a 6 foot deep tank? BTW - I'm not arguing or debating that tangs should be kept in small tanks. I'm just saying making an arbitrary tank length 'limit' does not seem logical to me. By the biggest tank you can afford - and if the fish get too big or problematic re-home them?