If you like fish I think the ideal size is 180. Yes this happens to be what I have now, and if I had my way it would be bigger but :
I can keep most tangs (2-3) but I have my species pick besides the really huge ones. I don't have to be overly careful about other small fish. It's still a standard size tank so it wasn't too expensive to buy. I don't need a massive massive protein skimmer ect.
If you don't care much for fish and more for coral. I'd say a cube tank is ideal. As much as I love cube tanks unless I get a 6x6 I wouldn't get one due to the fact I love my achilles tang.
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