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These non-floating rocks don’t need to be soaked or siliconed, can be moved around, taken out and re-used. They are hollow, so in order for them to stay at the bottom of the tank, you will need to fill them with water and place them in the desired place in your tank.
Please specify the size of your tank and we will make the rocks in the appropriate sizes. You can also specify the color of the rocks (they can be made in the colors of any background model).