to the drawing 10 generally designates the improved three dimensional aquarium cover comprising the invention the three dimensional aquarium cover 10 is molded vacuum formed or the like from relatively thin preferably translucent plastic and the mold for forming the three dimensional cover may be so constructed that in the forming process portions of the three dimensional aquarium cover may be thinner than other portions thereby permitting greater amounts of light to pass therethrough all as to be more fully described hereinafter the formed or molded three dimensional cover 10 includes a base portion 12 and a top portion 14 the base portion includes a peripheral base member 16 which forms the major support for the cover the internal dimensions of the base member 16 is such to freely receive an aquarium 18 fig2 and 3 of the drawings the base member also includes four generally vertical upstanding corner support members 20a b c and d between the corner forming members 20a b c and d and the generally horizontal peripheral base member 16 are connecting webs 22a b c and d where desired the upper ends of the corner support members 20a b c and d are provided peripheral edge forming members 24a b c and d which are generally l shaped as more clearly shown in fig2 and 3 of the drawings preferably the peripheral base 16 and elements 20a b c and d 22a b c and d and 24a b.