So pimp.
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It may have to do with the overflow reserve area where they keep the Pumps that power the closed loop type flow in the tank, As this is not part of the display tank. And the ATO is also in this same false back area of the tank. AC said the display was 150gal the total with the false back may be the difference?Answer: 650 L = 171.711 gal
US pricing for Red Sea Max S 400, 500 and 650 revealed, available to Americans very soon
http://www.redseafish.com/uploadimages/brochures/MAX500 brochure online 2011_GB.pdf
Kevan is correct...Bart's question was 650=650gal?