Indian Jumbo Stone Mix - 25 kg Indian Aquarium Chips and Stones | Gravel | Stones and Rocks | Decorative Elements | Sand. The best types of substrates for aquariums | 25 kg. Jumbo stones are ideal for decorating aquariums, as they can add a wonderful color contrast compared to other rocks or decorations in your tank, and they will stand out clearly against driftwood and slate stones. The stones are considered one of the most important parts of an aquarium because they keep the water pure and healthy for a long time. They are also considered a great part of the decoration. These stones provide a very healthy environment for plants and fish.