I have a 60 gallon 33" wide x 18" Deep x 24" high tank and am moving to a 90 gallon. I find that the 33" - 36" tanks are not wide enough for my liking. if I was trying to stay with in the 60 -75 gallon tank range I would be looking at a 4 foot by 18 inch and 16 or 20 inch high tank (depending on your over all water volume you want.) the 90 gallon tank with sump is right at the 120 - 130 gallon total water volume and why I stopped there. I would have liked to have gone with a 48"x24"x18" high tank for more swimming space for the yellow tang. but just my 2 cents.
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