【100% Natural Stones】The uniqueness of a 100% real natural slate will add beauty and reality to your creation; It features a weak alkaline pH value and has stable chemical properties in water. Best for aquarium looking slightly up 【Rich Applicable Scenes】It is suitable for various scenes, such as aquarium landscaping, plant landscape cover, miniature fairy tale garden, reptile and amphibian fence, war games, etc. It is a perfect stone for building habitat rock 【Multiple Uses】The natural Tonwa Stones can save heat (from light or other heat sources) for amphibians, reptiles, or other pets who love high temperatures. It can be glued together with safety glue to create caves, cliffs, and mountains for fish and plants in aquariums. You can also use them for home decoration in bowls and vases and floor covering of indoor plants. 【Unique Texture & Color】The color of natural Tonwa Stones is naturally gray, black and white, and the color will be darker in humid environments. The uniqueness of 100% natural white granite texture in stripe adds a sense of beauty and reality to your creation. Because it is a natural 【Product Specification】Each box of stones is made of 2 to 8 inches of rock through our careful hand-picked inspection and selection, with perfect size and shape. No two stones will be the same. Net weight: ~17 pounds, pH value tested in freshwater: 7.2~8 in the density of 2.8lbs per gallon water. Suggest using more volume of water if you are looking for lower pH aquarium setting up. LANDEN Tonwa stones may slightly raise pH and water hardness. LANDEN Aquarium Soil can help balance that out. LANDEN Natural Tonwa Stones Slate Stones include 2 to 8 inches of rocks, a total weight of around 17 pounds. Safe and harmless. Ideal for various scenarios such as aquariums, plant covers, miniature fairytale gardens, caves, cliffs, mountains, reptiles, amphibian encloses, stone carving and handicrafts, war games, etc. LANDEN Tonwa Stones is a gift from nature with a natural and realistic view for your landscape plants and amphibians, reptiles, creating a friendly habitat, and providing natural support for aquatic organisms. It is the ideal aquarium decor rock for all of your aquarium and terrarium animals' landscape ideas. The uniqueness of 100% natural white granite texture in stripe adds a sense of beauty and reality to your creation. Each stone is hand-selected, inspected, and cleaned. Safe to aquatic plants and organisms. Suitable for various Settings, it is also an ideal stone for building habitat rock formations such as pavements, benches, steps, arches, caves, ground coverings, etc. These natural stones can retain heat (from light or other sources) for amphibians, reptiles, or other hot pets; They can be held together with safety glue to create caves, cliffs, and mountains for fish and plants aquariums. You can also use LANDEN Tonwa stones for decorating bowls, vases, indoor plant floors, etc. LANDEN Tonwa stones have a natural grey and white texture, which is darker in wet conditions. Note: Rinse thoroughly before use. Not suitable for children.