I have an old 72 gal bow front that was set up for saltwater. The bottom is drilled and there was a plastic overflow attached to the inside rear glass. The over flow was removed to turn it into a terrarium. I would like to restore it to being a saltwater tank. Is there anyplace that I get an overflow of the type built into saltwater aquariums? As a last resort I can always get a hang on overflow, but I prefer to restore it to its original configuration.