since the footprint isn't much bigger then a 6ft 240g tank.... the tiny sump isn't as bad as we think. Don't get me wrong... it is small.....but not much different then a 300g 6ft tank.
Dutch aquariums that Aquarium Adcenture sells/sold did this, they put 500+ g tanks matched with tiny 20-30g sumps. Works OK until the power goes out