Gray Melaleuca Aquarium Stone 22 Lb. (10 Kg) Décor For Landscaping Aquariums With Natural Rock. Gray Melaleuca Stone makes for a very attractive finish to your aquarium. Each piece is different as is a natural product and 10 kilo or 22 lb in weight is usually 4 to 6 pieces. Due to being a natural product may not look like picture. Excellent for Aquascaping aquariums, terrariums, vivarium’s and other pet enclosures. These stones naturally hold heat for reptiles or other heat loving pets. They can be glued together with aquarium safe glue to create caves, cliffs and mountain ranges for fish and plants. Will not alter water chemistry and safe for aquariums. Rinse in water prior to placement in tanks.