180/220s are common sizes that you can pick up from typical manufacturers (AGA, Marineland...). Look around and see what options you have local and then look up reviews for that manufacture. If you're wanting a custom tank you'll pay a bit more.
marineland makes a 300 gallon deep dimension tank standard. the dimensions are 6feet/ 3 feet/ 27 inches. i believe those are right but it is a standard tank size not custom
If you're limited to 6 feet that 300 DD is probably the biggest tank out that is not custom. I'd agree that the 180 is probably the best option but if you are wanting the biggest 6 footer the 300 DD would give you 84 7/8" inches if the tang swam diagonally from the left bottom back corner to the right top upper corner.:spin1:
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