A containment vessel includes a tank having a front wall, a back walk two side wails, and a base. A top perimeter is defined by a top edge of the front wall, the back wall, and the two side watts and a bottom perimeter is defined by the intersection of each edge of a perimeter of the base and a bottom edge of each of the front wall, the back wall, and the two side walls. An over-frame is coupled to both the top perimeter and the bottom perimeter to at least partially visibly conceal the top perimeter and the bottom perimeter. The over-frame includes an over-frame top portion having a plurality of corner elements and side elements that are coupled together and an over-frame bottom portion having a plurality of corner elements and side elements that are coupled together.
