The ceramic Moon Rock glows in the dark! Each one is individually poured so no two are exactly alike. This finely crafted, man-made decoration is hollow and displaces very little water in your aquarium. Made with resin-free, petroleum-free, and lead-free materials. The spacious interior encourages exploration while simultaneously providing a stress-free refuge and potential breeding territory. Ideal for live-bearing tropical fish, most notably African and South American Cichlids. Underwater Galleries replicas are molded with care and hand-glazed for an eye-catching, natural look. Heated to more than 2100 degrees and forged into high-fired ceramic.