A process for the dual use of packaging for a fish-related product , namely fish food, water treatment chemicals or a fish-related consumable product normally dispensed into an aquarium , comprising the steps of: providing a dual use package including a housing having a three-dimensional shape, an internal compartment within the housing for containing the fish-related product therein, a primary opening with an associated cap for accessing the internal compartment , and a secondary opening with an associated plug for selectively opening or closing the secondary opening ; dispensing the fish-related product from the internal compartment through the primary opening into the aquarium while the package is outside the aquarium ; and after the fish-related product has been completely dispended from the internal compartment , performing at least one of the following steps a) to c): a) adding ballast to the internal compartment , b) attaching an anchor to the dual use package and securing the anchor within the aquarium , or c) causing the dual use package to be buoyant in the water , attaching an anchor to the dual use package by a length of fine cord, and securing the anchor within the aquarium , followed by finally submerging the dual use package in water within the aquarium ; and utilizing the dual use package as a decorative ornament in the aquarium after it has been submerged in the aquarium below the water surface. providing a dual use package including a housing having a three-dimensional shape, an internal compartment within the housing for containing the fish-related product therein, a primary opening with an associated cap for accessing the internal compartment , and a secondary opening with an associated plug for selectively opening or closing the secondary opening ; dispensing the fish-related product from the internal compartment through the primary opening into the aquarium while the package is outside the aquarium ; and after the fish-related product has been completely dispended from the internal compartment , performing at least one of the following steps a) to c): a) adding ballast to the internal compartment , b) attaching an anchor to the dual use package and securing the anchor within the aquarium , or c) causing the dual use package to be buoyant in the water , attaching an anchor to the dual use package by a length of fine cord, and securing the anchor within the aquarium , followed by finally submerging the dual use package in water within the aquarium ; and utilizing the dual use package as a decorative ornament in the aquarium after it has been submerged in the aquarium below the water surface. a) adding ballast to the internal compartment , b) attaching an anchor to the dual use package and securing the anchor within the aquarium , or c) causing the dual use package to be buoyant in the water , attaching an anchor to the dual use package by a length of fine cord, and securing the anchor within the aquarium , followed by finally submerging the dual use package in water within the aquarium ; and utilizing the dual use package as a decorative ornament in the aquarium after it has been submerged in the aquarium below the water surface. <EOS>