Aqua Reef 400 and Discus fish

[bcutajar]

Hi there, im in the process of looking for a new tank that i can grow my discus in. I came across a Aqua Reef 400 and know it is made for a marine tank, but my question is would this be great for housing discus. The guys at the fish shop say it would be but are they just trying to sell a product. Also if the tank is suited is the filtration good enough ? Thanks